autoflower grow tent

Learn How To Grow Autoflowers: Week-By-Week Guide

Autoflowering strains provide fantastic results in little time, often surging from seed to harvest in as little as 8 weeks. Both beginner and advanced growers will have a fun and easy time raising these varieties.

Learn to grow autoflowering cannabis.

  • 1. How long do autoflowers take from seed to harvest?
  • 2. Light schedule for autoflowering strains
  • 3. A note on pH
  • 4. Autoflowering grow guide: How to grow autoflowers week by week
  • 5. Which autoflower to choose?
  • 1. How long do autoflowers take from seed to harvest?
  • 2. Light schedule for autoflowering strains
  • 3. A note on pH
  • 4. Autoflowering grow guide: How to grow autoflowers week by week
  • 5. Which autoflower to choose?

Autoflowering cannabis plants are hardy, fast, and easy to cultivate in confined spaces. What’s not to love? Learn how to grow them week by week below.


Autoflowering strains typically move from seed to harvest in 8–10 weeks. However, some varieties can take up to 12 weeks to fully mature. Strains such as Bubble Kush Automatic and Quick One fall towards the faster end of the spectrum, whereas varieties like Royal Creamatic and Royal Haze Automatic take a few more weeks to ready their buds for harvest.

Many growers elect to cultivate autoflowers because of their speedy growing rate. Their hardy genetics and forgiving nature also make them easier to grow and therefore more beginner-friendly.

Their impressive resistance to pathogens and pests allows them to withstand the challenges of outdoor growing.

However, their yields aren’t as spectacular as those obtained from photoperiod giants, but, the trade-off for brevity makes the decision worthwhile for most growers.


As the name suggests, autoflowering strains don’t require a change in the light cycle to enter the flowering stage. Many growers choose to keep their autoflowers on a light schedule of 18 hours on and 6 hours off during the entire growing cycle. Other cultivators choose to keep their lights on around the clock in hopes of maximising photosynthesis and growth rate, however, this can get quite expensive.

Because of this unique trait, outdoor growers can achieve multiple harvests during a single growing season. By germinating seeds week after week in early spring, you can theoretically rake in your first harvest after

8 weeks, with subsequent weekly harvests when growing fast strains.


The pH value of your soil will determine how well your plants can access the nutrients within. If the pH becomes too high (alkaline) or too low (acidic), nutrient lockout will occur and deficiencies will set in. Cannabis plants thrive in a soil pH of between 6.0 and 6.5. Use a pH tester to track pH throughout your grow.


Follow the fail-safe week-by-week grow guide below for a quick and easy route to harvest time. We cover all of the parameters and variables you need to consider—at the correct times—to ensure your plants remain healthy, vigorous, and productive.

(Week 1) (Week 2) (Week 3) (Week 4) (Week 5)
(Week 6) (Week 7) (Week 8) (Week 9) (Week 10)


Germination usually takes 1–3 days. During this time, your seeds will activate and send a root down into the soil and a shoot above the surface. To begin the germination process, you’ll need to prepare a suitable soil mix. Autoflowers don’t need as much nutrients as photoperiod varieties and prefer light and airy soil.

You can make your own potting mix using the following formula:

  • 3 parts peat moss
  • 3 parts compost
  • 2 parts perlite, moistened
  • 1 part vermiculture, moistened

After you’ve prepared the mix, add some Easy Boost Organic Nutrition to the blend. These pellets will slowly release adequate levels of nutrition into the soil, providing foundational elements and minerals for the entire growing cycle. Add some mycorrhiza to the soil to help your plants flourish later down the line. These symbiotic fungi will bind to the root system and help your plants uptake nutrients more effectively.

Next, poke a 10–15mm hole into a pot with your soil mix. Sow your seed directly into its final pot to avoid the stress of repotting later down the line. Transplanting causes plants to go into shock, and autoflowers grow so fast that they’ll struggle to recover. Place a seed in the hole and cover lightly with soil. You’ll see your seedling emerge in the next few days.

Environmental factors play a key role in optimal germination. Aim for the following to boost your success rate:

  • 70–90% relative humidity (RH)
  • 22–25°C air temperature

Autoflowering cannabis strains grow fast, remain compact, and offer great results. Use this guide to learn how to cultivate them week by week!

Your First Grow Setup – How to Get Started Growing Autoflowering Cannabis

So you’re ready to start growing your own supply, but you’re not sure where to start. Searching on the internet seems to lead to an endless variety of choices regarding how, when, and where to grow your weed. You come away from your research more confused than when you started, but growing marijuana doesn’t have to be that difficult or complicated. Stick to the basics, don’t overthink it, and you can quickly grow massive autoflowering beasts with a minimum investment of both time and money. We’ll start with the easiest way to grow ganja, outdoors, and then detail what you need to begin cultivating indoors.


A cannabis seed is a machine that turns sunlight, dirt, and water into weed, and all three of those things are free or close to free if you plan on cultivating indoors.

Your plants should ideally receive at least two or three hours of direct sunlight before 4 PM, but more certainly won’t hurt them. There’s no such thing as too much light when growing outdoors. Plant in a place where the morning and midday sun will shine directly on them. Of course, depending on your location you may need to balance direct sunlight with discretion. Fast Buds seeds grow well on apartment balconies and terraces, but not everyone lives in a place where you can display their hard work in plain view. Please stay safe and respectful of local laws and customs. If you have to sacrifice an hour or two of sunlight to protect your plant, or yourself, do it! Don’t forget to check out the Top 5 Best Outdoor Autoflower Strains.


The water needs of your cannabis plants will change based on your location. If you live in a tropical environment, you may have problems with too much water, and you’re growing season may be as short as three months. If you live in a drier climate, you’ll have a longer growing season but will need to water your plants regularly.


Growing indoors takes more forethought and effort as you need to provide everything for your plants in place of mother nature. That means you’ll need a dedicated spot in your home, a light source, water, an electrical timer, carbon filter, and fan. Don’t miss our Top 5 Best Indoor Autoflower Strains.


Most indoor growers have light-proof tents in which to grow their plants. This allows them to control light, humidity, temperature, and more without changing them in the rest of their home. Small grow tents, perfect for one or two autoflower plants, can be found online for under 60 Euros.

If a tent in your home is too conspicuous, you can always follow the great American college dorm room tradition and grow in a discreet closet. Alternatively, you can build your own stealth grow chamber and disguise it as you see fit. Is your home already filled with computer parts? Then a PC-tower grow box might blend right in. Audiophile? Then a large speaker housing is a perfect option. Work or know someone who works in a kitchen? You can build an easy to hide “spacebucket” from 5 gallon or 20-liter buckets commonly used in commercial kitchens.


You’ll need your own replacement for the sun if you’re growing outdoors. There a few basic options to choose from. Here’s a brief rundown, but don’t forget to check out our full article on cannabis lighting options.


Fluorescent lights come in a variety of forms, but all use modest amounts of electricity, are easy to buy at any hardware store, and they’re inconspicuous as well.

HID Bulbs use a lot of electricity, produce a lot of heat, and will significantly increase your yields. However, they take up a lot of space and are hard to fit in stealth grow spaces.

LEDs have come a long way. A single 100-watt cobb LED light will power a one or two plant tent, making it the cheapest, stealthiest option for private growers.


You’ll need to water your plants. How much depends on your growing medium. See below.


Autoflower cannabis seeds will grow and flower regardless of light schedule. Many experienced growers recommend 20 hours of light followed by four hours of darkness, but 18/6 and 24/0 plans are also common. If you’re not running 24-hour lighting, you’ll need an electrical timer to keep your schedule consistent. While the plants will survive anything you choose, you’ll want to keep the schedule regular. Inconsistent light timing can stress your plant and lead to lowered yields, or, even worse, hermaphroditic traits.

Carbon Filter

Good cannabis stinks. Growers may love its strong, pungent, and lingering odor, but the neighbors probably don’t. Be a good neighbor and protect yourself from nosy passers-by with a carbon filter and fan. This virtually eliminates all odor outside the tent, meaning you can grow with peace of mind.

Growing Medium

For your first grow, stick with nutrient-rich soil or a combination of coco coir and soil. There are other high-maintenance options including hydroponics, but we’re keeping it quick and straightforward. Fast Buds seeds produce massive yields when grown in properly selected soil. Check out the soil section in our article, “How to Grow Cannabis Indoors” for more info.


For your first grow, skip the nutes and invest your time in selecting the best soil possible. Spend your first grow getting to know the cannabis plant’s lifecycle and keep it simple. If you’ve chosen the right growing medium, your plants shouldn’t need any additional nutrition to offer a respectable yield.

As every setup provides different base-nutrients, it’s impossible for us to make fertilizer recommendations that would apply to all our customers. If you absolutely must use nutrients for your first grow, be sure to ask the manufacturer how to use with autoflowers.

That’s all you need to get started growing! Be sure to follow Fast Buds on Facebook to stay up to date with all the latest grow tips, deals, and giveaways from Fast Buds!

So you’re ready to start growing your own supply, but you’re not sure where to start. Searching on the internet seems to lead to an endless variety of choices r