Low Stress Training (LST) Tutorial
Table of Contents
Introduction to Low Stress Training (LST)
Low Stress Training or LST is like bonsai for cannabis plants. It’s the practice of gently bending stems and tying them in place to drastically change the shape of the plant. This is done to create multiple bud sites, even out the canopy, and overall help you use light more efficiently. Using LST can increase marijuana yields without changing your setup, and it’s also surprisingly fun!
Example: All this bud is growing on a single 18″ tall weed plant in someone’s homemade grow box. LST forced the plant to stay short and grow multiple colas.
Low stress training can be used to grow marijuana plants in any size or shape. This grower trained his outdoor cannabis plants to grow flat like hedges by training stems to grow along a ScrOG net.
How to Use LST to Your Advantage
What is “Low Stress Training” and how does it increase yields for cannabis growers?
Low stress training is used to form a relatively flat, even canopy. This exposes many bud sites to direct light instead of just the top main bud. As a result, trained marijuana plants naturally create more (and bigger) buds in the same environment or setup than untrained plants.
There are other free cannabis plant training techniques that are more “high stress” such as manifolding the plant, but LST will not stress your plant or slow down growth much, if at all.
Two Papaya plants were LST’ed to produce many fat, thick colas!
LST is a free, gentle & effective training technique for all cannabis plants
The idea behind LST is to bend and otherwise gently manipulate cannabis so your plants create multiple main “colas” or buds. Additionally, Low Stress Training lets you produce plants that grow in the exact shape and size you want, giving indoor growers much bigger yields from the same grow lights.
The LST technique can be used to reduce the height of marijuana plants that are getting too tall for your setup, or are growing taller than your other cannabis plants. LST allows you to keep an even canopy and get as much bud as possible from your light.
Benefits of Low Stress Training
Bigger yields from the exact same grow lights and setup
Complete control over height, shape and size of plant (helpful both indoors and outdoors!)
Plants produce many big buds instead of just a single main bud and a lot of tiny ones
This marijuana plant is only a foot tall yet is engulfed in fat buds.
Now take a look at the “guts” of this plant to see how this shape was achieved with LST. It was trained to grow in a spiral!
The main stem was first bent down and away from the center of the plant, towards the side. After that, the grower continued to bend the main stem in a circle around the plant. As a result, several lower growth tips rose up to become colas with fat chunky buds, giving much bigger yields than if there was just one main cola.
LST allows a better distribution of light since all parts of the plant (and therefore all the potential bud sites) are located the proper distance from your grow lights.
When it comes to indoor growing, bud sites at the proper distance from your grow light (in the “Sweet Spot”) produce the biggest buds.
Wait, what distance should my grow light be from my plants? What’s the sweet spot for my particular grow light? Learn even more about cannabis grow lights here.
The percentages on the sides of the following diagram describe how much light is getting to your plants according to the Inverse Square Law of Light Intensity.
As you can see, the light intensity drops off fast as you get further away from the lights! You need training to get more buds in that sweet spot.
Why settle with just one big cola when you could have many huge colas?
How Does Low Stress Training Work?
Low stress training involves bending unruly branches and using gardening wire or soft ties to hold the branches where you want them.
The majority of growers use LST are trying to keep their plants short and wide to take advantage of grow lights (or possible the sun), which means that you want to bend any branches down and secure them away from the other branches, so you’re creating a wider canopy with many colas for bud to grow out of.
Bend too-tall branches down and away from the center of your plant. Tie them down. Repeat until plant is flat!
If some of the colas are getting taller than the others…
Bend the tallest ones over until they’re all the same height as each other and secure them down with something like twisty tie or plant ties. Repeat if necessary.
As the plant starts making buds, it will form multiple colas because all the colas are located at the top of the plant and getting direct light
After harvesting all the buds, you can see the “skeleton” of the plant.
Some growers like to install a tomato ring so there’s something to attach the plant to besides the pot itself. These can also offer additional support if the plant gets very large down the road.
This grower stuck a few bamboo stakes in every pot, which can also be used for support.
When growers LST their plants, the general idea is to gently pull branches away from the middle of the plant, so that the plant looks like a star when viewed from above. This helps expose the lower branches to more light, while also keeping plants short.
Many growers cut or pinch off the tops their plants before starting LST work. This is not necessary but can be helpful. The reason for pinching off the tops is it breaks the apical dominance of the cannabis plant, splitting the main cola, and providing a more symmetrical base of the plant for training.
However, any cutting technique is not actually considered LST. LST is simply the act of actually bending and manipulating stems. Other plant training techniques are often used alongside LST to get the best results, and topping the plant when it’s young is one of the most popular ways to “set the stage” for LST. But topping your plant isn’t for every grower. In this article’s step-by-step LST tutorial below, I’ll walk you through the entire process of how to LST cannabis plants including any special plant training techniques.
Here’s a great LST example by Santacabrera showing how to gently bend the middle colas of a plant down and away from the center without cutting the plant. Instead of cutting off the main cola, he simply bent it over like all the other side branches
Auto-Flowering Strains: Those who are growing auto-flowering strains are often encouraged to skip the cutting part and go straight to LST. Auto-flowering plants go through their entire life in just 2-3 months and may not have a long enough vegetative period for the plant to recover from a cutting/topping technique if it goes wrong. However, auto-flowering strains can be topped if you do it right! Learn how to train auto-flowering plants properly here.
After a stem is bent over on the plant, each of the growth nodes on the stem can become new colas if they’re exposed to light and air
Eventually all the growth tips on a horizontal branch will start growing upward toward the light and become full-blown colas.
After initially bending your plant, it’s possible growth may slow down for day or two as the plant recovers, especially if stems are damaged in the process. But usually with LST there’s little to no recovery time and the plant gets right back to business as usual. Often times they’ll be pointing back up at the light in just a few hours.
If you plan on using LST, I highly recommend getting a spool of plant ties, twisty tie or coated wire to tie your plants down with. There are many options available at your local gardening store or online, or you can rig something together yourself. More on that below. This gives you the power to craft the shape of your plant like an artist.
Don’t use string or anything sharp to tie down plants for LST!
Anything sharp can cut into your plants as they grow bigger, which you don’t want. Open wounds are not good for cannabis growth. But soft wire ties, twisty ties, or anything soft and bendable will work perfectly without hurting your plants.
Twisty ties are good for smaller stems
Soft wire ties are much stronger and can hold on in almost any situation
The stems you bend over with LST can be tied to the pots your plants are in, your hydroponics bucket, a tomato cage or most anything you can think of.
My main piece of advice is to make sure that you can pick up your plant as one unit. Don’t anchor any part of your plant to the floor or it will be difficult to move your plant!
Low Stress Training Encourages Plants to Grow More Wide and Bushy
Learn how one grower uses Low Stress Training to create a “Screen of Green” in his cannabis garden.
Some growers also gently bend flexible branches until they snap slightly or crush the bent part between their fingers to cause slight damage to the bent point. This technique is known as super cropping.
Whenever you notice some stems are getting taller than others, bend them over and secure them down. This ensures a nice even canopy!
Basically, you’re training the plant to grow into the shape you desire, like a marijuana bonsai tree. You train the plant slowly and take care not to hurt you plant. You don’t want to snap any of the branches, and never try to bend stiff branches or they’ll just break off.
If you accidently hurt the plant, and you create an open wound, it’s important to tape up the wound to keep it closed while also providing support to the stem. The tape acts like a bandage and cast until your plant has healed.
If you accidentally snap a stem while bending, tape it up immediately! Most of the time your plant will recover just fine.
By using the LST method alone, you can grow a plant that conforms to nearly any shape that you want.
How to LST Your Cannabis Plants
Supplies for Low Stress Training
A young vegetative cannabis plant
Soft wire ties (optional) – only get these if you’re going to grow very large plants; they’re overkill for small plants
A dash of Creativity
What else can be used to secure plants? I’ve seen growers use pipe cleaners, coated wire, and more. You can use almost anything that isn’t sharp or thin like string (string can cut into the “skin” of the plant after a while).
Step 1: Top your young plant when it’s got 4-6 nodes.
The purpose of any cannabis cutting technique is to break the apical dominance of a cannabis plant. When you cut the “trunk” or main stem of a cannabis plant, the plant tends to start branching out and allowing lower growth tips to rise up and become colas.
Topping makes it easier to LST a cannabis plant, since you’re given a more symmetrical “platform” to build your base off of instead of working just with one main stem. Using the topping training technique will encourage your plants to start growing more wide and bushy.
I prefer to top my plants when they’ve grown 4-6 nodes, although some growers top earlier. I typically top plants down to the 3rd node, which forms a more symmetric base compared to topping higher up on the plant. With topping you always end up with two main colas that split at the same place on the stem.
Don’t let your cannabis plant get bigger than this before topping if you can help it!
If you top your plant too early, it can stunt growth and your plant may take a while to recover. Your plant should be healthy and growing fast. A vigorous plant will recover quickly from topping, but a very young or slow-growing plant can get stunted for days or weeks from a single topping.
Although it may seem counterintuitive, letting the plant grow 6 nodes first can make the whole process go more smoothly because at that point there is very little chance of stunting your plant.
Top Down to the 3rd Node
As we explained earlier, “topping” means to cut off the top of a plant or stem. In the picture below, the top of the plant has been removed, so that only 3 nodes (pairs of fan leaves) are left.
When topping, leave a little part of the old stem above the topping point. I know this may be hard for those who want to make everything completely even and neat. But leaving a little extra stem will help prevent your “elbows” from splitting until they have thickened.
The little growth tips nestled in the V of each fan leaf will become your new colas, so be careful not to injure them!
After this, it’s time to let your plant grow naturally for a while, until it’s grown several new nodes on each of the two main growth tips.
Note: Some growers will top multiple times to create a “manifold” at the bottom of each plant. Learn more about manifolding: https://www.growweedeasy.com/manifold
Step 2: Bend over tallest stems and tie them down.
It is essential that you start any Low Stress Training as soon as possible. It’s best to start when your plant is very young, though with LST, it’s better late than later, and better later than never.
The main idea is to keep all the stems about the same distance from the light. So, you want to continually bend the tallest stems down to the level of the others, and use twisty tie to secure it in place.
Even if you never top the plant, you can simply bend it in the direction you want it to go
Another basic technique is to create a “star shape” from above. As your plant grows, you bend stems down and away from the middle of the plant, tie them down.
If you were unable to or chose not to top your plant, you need to bend over the main stem. Here’s two examples of what that looks like from above:
Always bending the tallest stems down results in plants with a flat canopy
Some strains/branches will bend more easily than others. Young growth is almost always easier to bend than old growth.
Bend Stems When They Are Still Young and Flexible!
If you’re going to LST your plants, you’ll get the best results by starting early since it’s easy to bend stems when they’re young and flexible. As stems get older, they become hard and woody, making them difficult to bend without breaking!
Bending technique – try to bend only the flexible parts of stems, which are located near the tips
Bending Tips and Tactics
How exactly do you bend your plants?
The main ideas to keep in mind…
Be Gentle – Always bend very slowly and carefully. You can always bend more, but you can’t undo a broken stem
Only bend soft growth – Newer growth is soft and pliable, so it is easily bend to your will. It’s important to focus on bending the newer, most flexible parts of the plant to avoid breakage. If a stem feels stiff, it will likely break if you try to bend it.
Start Training Early – Start low stress training early in the plant life so you can avoid every having to try to bend thick stems. If you keep on top of plant training from the beginning, you will only even need to bend new growth and it will go much more easily.
Make Sure Ties Are Securely Attached to Plant – Don’t let wires or ties “scrape” or slip across the surface of a stem because it can cause abrasion (imagine something rubbing all over your skin until it gets raw). If you’re having difficulty getting a specific stem to stay down without slipping, try to secure that stem in more places so all the stress isn’t being placed on just one part of the stem.
Quick Summary: Do this at least once a week!
Choose a too-tall stem that you want to bend over
Check to make sure the stem is bendy where you plan to bend it – if it’s too stiff to easily move, choose a place higher up on the stem
Turn the end of a twisty tie into a hook and gently hook it around the stem
Hook the other end of the plant tie to the container after stem is bent as much as you want – this will hold the stem in place
Repeat for any other stems that are taller than the rest
This grower uses plant ties to LST a cannabis plant, and he demonstrates all the above steps
Basically, you’re training the plant to grow into the shape you desire, further creating your own cannabis bonsai tree. Always bend stems slowly and take care not to hurt you plant. You don’t want to snap off any of the branches, so never try to bend stiff branches; they’ll just break off.
How to Secure Ties to the Sides of the Container
If you picked something made for plant training, like plant ties or soft wire ties, it can be a lot easier to secure your ties since these can be bent to hook onto almost anything, like the lip of a plant container
Some growers drill holes around the top of their plant containers so that ties can be secured through the holes
With fabric pots, the sides can be pierced (for example by safety pins) and ties can be attached to the safety pin
Many growers stick something in the soil and use that as an anchor to attach ties to, for example bamboo stakes or a tomato cage.
You can really get creative about this!
Don’t tie down your plants in such a way that you won’t be able to tend them or move them! You’ll regret it later! For example, don’t secure ties to something on the ground, or something else in the grow space. Try to make a self-contained container that you can pick up and move without disturbing any of the ties. This is why so many growers attach ties to the sides of their containers.
Since the tie is attached to the pot, the entire plant can be picked up and moved without accidentally pulling out ties, breaking stems, or otherwise messing up the LST job
Another example of hooking your ties to something that will always remain attached to your plant and its container
You will not be able to train your plant just once and that’s it. The plant training process needs you to watch over your cannabis plants so you can slowly create the shape you’re looking for. It also helps you quickly spot any unruly branches so you can bend them over before they get too stiff.
One thing to remember, bent stems immediately “realize” they’re sideways, and any part that is not tied down will immediately start growing upwards again. The unbound parts of a healthy plant will point up again in just a few hours. If you check your plants a few hours after bending, you’ll be able to see exactly what I mean.
This is a pic of a cannabis plant immediately after an LST session – most of the stems are on their side
17 hours later, all parts of the plant not tied down have stood back up
Because of the quick recovery time experienced by cannabis plants in the vegetative stage, LST can be used to create short, bushy plants in a very short amount of time.
No matter how you secure your plant, the main idea is for it to hold down the branches in the shape that you want, while still allowing you to easily tend to your plants as they get bigger.
That’s worth repeating, don’t tie down your plants in such a way that you won’t be able to tend them or move them! You’ll regret it later!
If you accidentally snap a stem, tape it up immediately like a cast – the plant will quickly heal itself as long as the two broken ends of the stem are held firmly together
With LST, you’ll get the best results if you check on your plant at least every few days to see if any stems are out of place, so you can quickly bend them over where you want.
Step 3: Initiate the Flowering Stage
Continue to LST your plant throughout the vegetative stage until you get the height, width and shape you want.
You’re ready to start flowering when…
You’ve transformed your cannabis plant into a horizontal table
You’ve reached half your desired plant height (since the plant may double in size after the switch to the flowering stage)
Learn how to initiate the flowering stage by changing the light schedule: https://www.growweedeasy.com/light-schedules
LST In Flowering Stage
When a cannabis plant is switched to the flowering stage, it can double in height within just the first few weeks. This is known as the flowering stretch.
But all that new growth needs to be controlled so you can maintain the amazing canopy you’ve been working on throughout the plant’s life!
So once your plant starts flowering, you should continue to watch out and use LST for the first few weeks, if needed, while your plant goes through her final growth spurt. During this period, you should try to avoid touching new buds as much as you can, but don’t worry if it happens a little – we’re only human ?
After the first month of flowering, your work is pretty much done as far as LST. Phew! Now you get to sit back and just wait for your buds to fatten up. At this point, your plant is putting all its energy into making flowers/buds, and your plant structure will not change during the last several weeks of flowering.
After the first month of flowering, it’s best to use LST only sparingly as needed, like when you have a troublesome stem that is cutting off light to other parts of the plant, or if a cola has grown too close to the grow lights.
It is NOT recommended that you start LST while your marijuana plants are flowering. Proper LST must begin when the plant is in the vegetative stage, because by the time you get fully into the flowering stage, the majority of the plant structure has already been formed.
If you’ve LST’ed properly in the vegetative stage, your plant should naturally start growing rows of colas along the flat table you produced, and you’ll get plants that produce bigger yields from your same grow lights.
These two plants produced nearly a pound and a half under a 600W grow light due to LST and other plant training methods
(view the full grow journal on this harvest)
As you spend time training and observing your plants, you’ll begin to get a much better understanding of exactly what you’re working with. I highly recommend viewing some cannabis time-lapse videos to get a better idea of how the cannabis plant grows.
That’s it! You now have all the tools you need to become an LST master and produce huge harvests of your own!
Low Stress Training is like bonsai for cannabis plants. Plants are trained to grow flat and wide, which forces them to produce many big buds instead of just one or two. As a result, LST gives you bigger yields without changing your setup!
Complete Guide to Cannabis Plant Training
Table of Contents
Introduction to Plant Training: Indoor Training Tactics for Bigger Yields!
Introduction: How to Train Indoor Plants for Bigger Yields
Are you interested in increasing your yields when growing indoors? If so, you’re in the right place! Plant training is one of the easiest ways to increase your cannabis yields without having to upgrade your light or setup. It can be used to increase your yields up to 40% compared to not training, and it’s free!
First off, what is plant training?
“Plant training” means physically manipulating the plant so it grows more bud sites, resulting in increased yields indoors
Why not let plants grow naturally? Cannabis naturally grows in a “Christmas Tree” shape that is optimized for sunlight, not grow lights. Unlike the sun, cannabis grow lights do not rise and set every day, providing light from the sides. Furthermore, indoor grow lights have almost no penetration when compared against the sun; the light from a 1000W HPS is usable for a few feet while light from the sun is usable to plants after traveling 93 million miles!
Even outdoors, lower buds tend to grow smaller than the top ones (cannabis is a wind-pollinated plant and favors buds that are higher up). But the lack of growth in lower buds becomes more pronounced indoors. With grow lights, the vast majority of the light produced is aimed straight down over the top of the plant, and in most setups the sides don’t get much light at all. Because of these reasons, the Christmas Tree shape can be really inefficient indoors, causing your plant to have just one big, top bud and many smaller ones that don’t weigh nearly as much.
The main idea of plant training is to create several top colas to take the best advantage of indoor grow lights so less light is lost and yields are higher overall.
Make many cannabis colas instead of just one!
Three main types of marijuana plant training
- Bending and securing parts of the plant while causing little-to-no physical damage to the plant
- Damaging or removing parts of the plant in a strategic way to get it to grow in a more desirable shape
- Manipulating timelines to get faster or bigger yields
Usually, growers will use more than one of these types of training because they can complement each other, but it’s also possible to use just one and not any others. For example, when growing auto-flowering strains you can’t manipulate timelines and it’s generally advised not to damage the plant since they have such a short life and that could result in stunting. So for auto-flowering plants, the main option is just bending and securing.
Next: a breakdown of each plant training technique so your garden has tons of colas!
Bending & Securing Parts of the Plant
Bending and securing parts of your plant is usually referred to as “Low Stress Training” (LST).
General Low Stress Training (LST) – LST is the process of bending stems and securing them in place. The general idea is to bend tall stems down and away from the middle of the plant as it grows so the plant takes on a more flat and wide shape. This should be started when the plant is still a seedling since its young stems will be flexible, while the stems of older plants become rigid and woody. Some growers use the term “LST” as an umbrella term to cover all types of plant training, while others use it to refer only to bending.
Plant Twisty Ties are commonly used to secure stems in place after bending them over, but lots of growers get creative (pipe cleaners, soft coated wire, etc). Just don’t use anything “sharp” like chicken wire because it cuts into the plant as it grows.
This grower consistently bent the tallest stems down as the plants grew, resulting in a flat, table-top shape
When the plant starts making buds, this flat, wide shape results in multiple colas that are all around the same distance from the light
Read the complete article on Low Stress Training.
No-Technique Plant Training – This is cannabis plant training in its most basic form. If it’s your first grow and you want to keep things simple, or if you don’t have much time and want to do the bare minimum to get results, this is for you!
The main stem was bent over 90° when the plant was very young, so all the lower branches were able to grow up and become main colas. Bending the main stem was the only training done to this plant, no fancy techniques!
Supercropping – this technique is a more “extreme” kind of bending, and is used for stems that are too tall but have become woody and difficult to bend. With supercropping you “soften up” the stem first before bending it at an extreme angle. Supercropping can be incredibly helpful towards wrangling an out-of-control plant, and it has a few other benefits too because it can stress the plant in a “good” way.
Supercropping involves extreme bending, but without hurting the “skin” of your plant
Read the complete article on Supercropping.
Screen of Green (ScrOG) is a technique where growers use a screen over their plants and weave stems through the screen as they grow. When the plant starts making buds it’s already in a flat, table-top shape with lots of well-spaced bud sites under the grow lights. The screen also provides support for heavy buds.
Example of Screen of Green (ScrOG)
Read the complete article on Screen of Green.
Damaging or Removing Parts of the Plant
These training techniques all involve pruning the plant in some way to improve growth and increase yields indoors.
Topping & FIMing are ways of damaging the plant at a very young age to lead to plants growing m0re bud sites.
In this next picture, notice how the plant sort of “splits” at one point near the base of the plant. That split is where the plant was topped or FIMed and the apical dominance was broken. As a result, the plant turned many stems into main colas instead of only growing big buds on one main stem
Read the complete article on Topping & FIMing
Topping – The idea is to completely remove the top of the plant’s main stem as a seedling. This breaks its apical dominance, or tendency to grow one main cola, and immediately splits the plant into two main stems. As a result of being topped at a young age, the plant will naturally grow multiple colas even if you don’t do anything else.
FIMing – A very closely related technique to topping. The idea of FIMing is to damage or “shave” the top of the plant instead of removing it completely. This can accomplish many of the same goals as topping, but has less of a chance of stressing the plant. The downside is it’s more likely to fail at actually breaking apical dominance (plant may still tend to grow one main cola).
Manifolding – This describes a sequence of topping the plant two times in a specific way so that it forms a wide “manifold” at the base of the plant. This is an easy way to achieve a lot of training without much time on your part. A benefit of training the plant with manifolding is buds tend to grow bigger, longer and more uniform than they would with some other training methods. The downside is topping your plant twice can add a week or two onto your grow.
Read the complete article on manifolding.
Defoliation – Defoliation means removing leaves on your plant, usually only the biggest fan leaves. This might be done in the vegetative stage for various reasons, but the main “technique” is using defoliation in a certain way during the first month of the flowering stage in order to encourage buds to grow bigger. With this technique, the cannabis plant is defoliated right before the switch to the flowering stage, then another time or two during the first few weeks while the plant is in the midst of the explosion of growth known as the flowering stretch.
Defoliation involves removing fan leaves in a strategic way in the first part of the flowering stage
This strategic defoliation exposes all the newly forming buds to light and air right when they’re at their most crucial stage of development. Because of how cannabis (a wind-pollinated plant) buds reacts to light and air, this dramatically increase the size and density of the buds as long as you take off the right amount of leaves at the right time (overdoing this or doing it too late in the flowering stage can do more harm than good!). It’s also very important to note that defoliation should only be done to indoor-grown plants, and even then only plants that are healthy!
Notice how few fan leaves this plant has? That’s because it was strategically defoliated during the first few weeks after the switch to 12/12. In response, the buds grew long, fat and dense.
Read the complete article on defoliation
These aren’t necessarily “training” techniques per se, but they are techniques that growers use to increase yields for free, and the main principle is the same – more buds directly under the grow light!
12-12 From Seed is the technique of trying to make seedlings start flowering (making buds) as soon as possible by giving them a “12-12” light schedule from seed. The idea is to get a harvest as quick as possible.
12-12 from Seed results in a quick harvest, but tends to cause stunted plants
Read the complete article on 12-12 From Seed.
Sea of Green is a related technique to 12-12 From Seed. The idea with Sea of Green is to grow many small plants instead of a few big plants. This allows a grower to make a sea of buds without having to do any plant training and can result in big yields that take less time. The main idea is to let seedlings grow for only 4-5 weeks before immediately switching them to the flowering stage. Since each plant doesn’t have to get very big, the time needed before flowering is reduced by several weeks. Many growers will also “top” their seedlings by removing the tips of seedlings when they have about 4-6 pairs of leaves.
For SoG, initiate the flowering stage when plants are this size or bigger
Sea of Green in Action
Read full article about Sea of Green
Why Should Growers Train Cannabis Plants to Grow Flat?
How Does Plant Training Increase Yields?
Indoor cannabis growers train their plants to grow with lots of thick bud sites because that shape produces the best yields under the limited power of grow lights.
As a grower, you can control a lot of the final size and shape of your plant by using proper cannabis training and growing techniques while the plant is young, such as topping, FIMing, LST, main-lining, supercropping, defoliation, SoG, ScrOG and more, as described in this page. This page explains everything else you can do to get your cannabis to grow the way you want, whether it’s small or big, so you get the best yields possible.
However, no matter how well you train your plants during the vegetative stage, some growth patterns (and many of aspects of your buds like appearance, smell and potency) are going to be determined by your plant’s genes, especially in the flowering stage. If you don’t have access to cannabis seeds or clones where you live, you can control the genetics by growing a strain from a trustworthy breeder and ordering seeds online.
Light is Like “Food” for Cannabis Plants
Many indoor and outdoor cannabis growers prefer to keep their plants relatively short, growing bushy and wide instead of tall and thin. Keeping small plants helps make sure each plant gets plenty of light – light is like “food” for your plants, and providing the right amount of light will give cannabis plants the energy to grow.
The spring/summer sun is all the light an outdoor cannabis plant needs to survive (as long as it’s getting direct light for the majority of the day). It can help with stealth to keep plants shorter than nearby fences or camouflage plants, and training is effective at that, but training isn’t really that effective at increasing yields outdoors.
Outdoors, the natural shape of a cannabis plant is already very well suited to using the light from the sun as it moves in the sky. The best way to get bigger yields outdoors is to grow a bigger cannabis plant with more bud sites. Ultimately, the most important thing you can do for outdoor cannabis plants is put them in an open space that gets as much direct sunlight as possible.
Notice how the plants that get the most direct sunlight grow the biggest
Why do indoor cannabis growers want short or wide plants?
For indoor growers, plants tend to yield more if a lot of the plant is kept just the right distance from the grow lights. This means trying to maintain a flat cannabis canopy under the grow lights and almost always using growth training methods like topping, FIMing, main-lining, ScrOG, etc. These training methods help make sure all the buds get as much light as possible, so you get bigger yields from the same grow lights.
Why do cannabis plants need to be close to the grow lights? It is because indoor grow lights are heavily affected by the inverse square law of light. Unlike indoor grow lights, the sun is so far away that the inverse square law of light doesn’t make a difference – your plant will get about the same amount of light whether it’s on the ground or 10 feet in the air.
Since indoor grow lights are so close and are so much weaker than the sun, the distance between the light and the plant has a huge effect on how much light the plant will receive.
Keeping grow lights closer will deliver more light to the plants!
But… keeping them too close can severely hurt your plant!
This is a huge part of why it’s important to understand how far away your lights need to be, depending on what type of light you have.
Powerful Grow Lights – Some grow lights are very bright and powerful (like MH/HPS grow lights or bigger LEDs). More powerful grow lights can cover a wider area with more plants, but the more powerful the light, generally the further it needs to be kept from your plants. Keeping grow lights too close causes light burn, which bleaches your upper leaves and buds, and can possibly cause seeds to form (plants may “herm” as a result of stress which causes seedy buds). Light burn can also possibly affect the potency of the buds.
Vegetative and early flowering plants are harder to light burn, but it’s much easier to do it in the second half of the flowering stage when the plant is no longer making any new leaves, especially with higher wattage lights.
Less Powerful Grow Lights – Grow lights like CFLs and fluorescent lights have a “sweet spot” that is only a few inches away. The further you get, the less light your plants get. These types of lights can grow cannabis plants, and may be a good choice for some growers, but with less powerful lights, it becomes even more important that you learn how to train your plants to grow short and wide with many colas. Little weed plants are the best way to take advantage of CFL grow lights! Luckily the methods on this page like topping, FIMing, SoG, ScrOG, main-lining and more will give you the tools you need to get the most from your grow lights. By using plant training techniques, it becomes possible to harvest ounces of bud even from relatively small grow lights.
In the diagram below, you can see that the natural plant (left – completely untrained) has less parts of the plant in the area with the best light level. As a result, this plant only has one main cola, and the rest of the colas are much smaller because they are further from the grow lights.
Leaves in the “Sweet Spot” of Your Indoor Grow Light Make the Most Energy, Producing Faster Growth and Bigger Buds
Why settle with just one big cola when you could have many big colas?
The trained plant (right – which has been topped and trained with LST) has many colas that are directly in the sweet spot. In fact, almost the whole plant is getting bathed in just the right amount of light from the grow lights. This means the plant has many big colas and none of them are getting burned by the lights.
Generally, the top of the grow light sweet spot is where the biggest buds form. Cannabis plants love a lot of light, much more than your average house plant. As long as you stay away from the “too bright” zone for your particular indoor grow light (which can cause light burn, even if air is cool), you want to get as many colas in the top of the sweet spot as possible.
Colas in the Top of the Sweet Spot Grow Biggest, So Maximize Yields by Training Cannabis Plants To Grow Many Colas On the Same Level!
It doesn’t matter what type of grow light you use. Each type of grow light has a sweet spot, and whenever grow lights are positioned above the plants, there are likely benefits to training your cannabis plants to grow short and wide. By having more of your plant at the best distance from your grow light, your cannabis leaves and buds will be exposed to more light and give your plant more energy to grow.
When your grow lights are positioned above your cannabis plants….
Plants with a flat canopy will produce more energy than tall & thin plants. As an indoor cannabis grower, you don’t have to just accept the way cannabis grows naturally. You actually have a lot of control over how your cannabis plants grow. So train your plants to efficiently fill up your grow space, giving you the best yields possible with your grow lights.
Don’t Grow This Plant!
Grow a Trained Plant With A Cluster of Colas!
This article on plant training shares several ways to train your plant to achieve this shape!
Now that you have mastered the art of cannabis plant training, what do you want to learn how to improve next?
Get a summary of all the most common plant training techniques that growers use to increase their cannabis yields indoors!