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The UK’s Best Seed Compost For Plant Germination

Give your seeds the best start in life by planting them in a specialist seed compost, designed to promote germination and healthy growth.

Seed compost generally contains fewer nutrients than all-purpose compost (as too many nutrients can overwhelm seeds in the initial growing stages), but a high amount of phosphate, to encourage root growth. It often contains leaf mould, coir, or a similar substance, in place of peat, and is finer in texture, so shoots can easily break through.

    • The UK’s Best Seed Compost For Plant Germination
  • Best Pick: Nutley’s 22mm Compost Plug Pellets
  • Value Pick: 10L Organic All-Purpose Potting Compost
  • YouGarden Seed & Potting Compost 10L
  • Dalefoot Peat-Free Wool Compost
  • GRO Sure Seed & Cutting Compost
  • What Is Seed Compost?
  • How To Make Your Own Seed Compost
  • Sand or perlite in the mix can help to ensure the compost has good drainage. A decent seed compost will encourage your seeds to germinate and grow, during the early stages. It is designed to promote the formation of strong root systems, and can usually be used for cuttings too – although you should always check the requirements of the species, before planting.

    Last update on 2020-11-22 / Affiliate links / Images / Pricing from Amazon Product Advertising API

    To help you choose the best seed compost for your new plants, we’ve put together this list of our 5 favourite options on the market, based on their nutrient composition, texture, user-friendliness, and value for money. With one of these specialist composts, your seeds are sure to flourish.

    These discs of dry seed compost expand with water to provide the perfect, compact growing medium for your seeds

    Our favourite option for sowing seeds is this Pack of 100 Nutley’s 22mm Compost Plug Pellets. These dry compost discs contain the perfect combination of nutrients, to provide the ideal growing medium for your new plants.

    Unlike conventional compost, these pellets come pre-divided into convenient amounts, ready to be placed in a seed tray, or in individual pots, and sown with seeds. They are incredibly compact and easy to use, and perfect for novice gardeners, or those who want to avoid waste.

    The 22mm plugs expand when they come into contact with water, to allow them to accommodate your seeds. The small size means you can plant lots of individual seeds (up to 100) in one space. However, bear in mind that even when fully expanded, the discs are still small, and may not be big enough for larger seeds, such as peas.

    For starting off smaller seeds though, these compost pellets are hard to beat. They provide your seeds with everything they need for the best start in life, and come in a highly user-friendly form.

    Pros

    • Provides the ideal growing medium for seeds.
    • Pack of 100 discs means you can plant up to 100 seeds.
    • Easy to transplant the whole plug to soil once seeds are germinated, with minimal disturbance to roots.
    • Can be used in seed trays or pots.
    • Easy to use – perfect for beginners.
    • Take up very little space.

    Cons

    • Discs are small, and may not be big enough for larger seeds – check the size before ordering, to make sure they’re suitable for you.
    • Some users report that their plugs started to go mouldy.

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    This peat-free potting compost contains coconut coir, and is highly affordable – but you will need to keep an eye on the moisture level

    This 10L Organic All-Purpose Potting Compost from Greenbrokers Ltd is a great value option, for those who want the freedom to use as much, or as little, compost as needed for their seeds.

    The compost is delivered dry, and expands to a volume of 10 litres when combined with water. This makes the bag small enough to be easily transported and stored, and is perfect for those users who might struggle with a heavy bag.

    To activate the compost, you simply cut open the top of the bag, pour in 3 litres of lukewarm water, leave to absorb for 5 minutes, and it’s ready to use. If you don’t need 10L of compost at once, you can separate out a smaller amount, and save the rest for later. The compost has a long life, which means that you can use it when you need it, and avoid waste.

    The formula contains all the essential nutrients for plant growth, including nitrogen, phosphate and soluble potash, and has a pH of 5.2 – 6.8. It’s produced from natural raw coconut coir material, and doesn’t contain any peat, which makes it more environmentally-friendly.

    It is a dry compost, and you will need to keep an eye on the moisture level, and water it regularly. Ultimately though, this is a great choice for anyone looking for a natural, organic seeding compost, that doesn’t take up too much space, for a highly affordable price.

    Pros

    • Organic, all-purpose potting compost.
    • Contains essential nutrients for plant growth.
    • Produced from natural raw coconut coir material.
    • Peat-free formula is more environmentally-friendly.
    • Small bag is easy to carry, transport and store.
    • Long-life means you can use it as you need, avoiding waste.

    Cons

    • Compost dries out quickly, and will require regular monitoring and watering.
    • Can be a little difficult to separate into smaller amounts.
    • Some reports of plastic pieces in the soil.

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    This seed and cuttings compost contains vermiculate and wood fibre, as well as a wetting agent, for superior moisture retention

    Our next option is this ForestGold 10L Seed & Potting Compost from YouGarden. This specially-formulated compost is ideal for potting seeds and cuttings in containers.

    The texture of this compost is particularly light and fine, which is great for seeds, as it’s easier for young shoots to break through, and helps to encourage root development.

    The formula includes vermiculite and fine wood fibre, and contains everything your seeds need to begin growing. It also contains a wetting agent, which helps the compost to retain water.

    It is delivered in a 10L bag, which is re-sealable, so you can use as much as you need at any one time. The bag has a built-in carry handle, to make it easy to lift and move around.

    Gardeners have used this compost to successfully start all manner of plants, including tomatoes, lettuces, cucumbers and peas, from seeds or cuttings. We’d recommend it for anyone looking to start growing their own veggies from scratch, and become more self-sufficient.

    Pros

    • 10L of compost for seeding and cuttings.
    • Encourages fast germination and root development.
    • Contains vermiculite and fine wood fibre.
    • Wetting agent helps with water retention.
    • Fine texture is ideal for growing shoots.
    • Bag is easy to reseal and carry, thanks to the built-in handle.

    Cons

    • Some users report that the compost attracts bugs.

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    This sustainable, peat-free seed compost is made from wool and bracken, and has excellent water retention abilities

    If you’re looking for a high-quality, natural seed compost, check out this Dalefoot Wool Compost. The formula is entirely peat-free, which makes it considerably better for the environment.

    It consists of a sustainable mix of bracken and wool, which comes from sheep at the Lake District National Park, where the compost is manufactured. Wool contains a high level of potassium, which is essential for plant growth, so it makes an excellent medium for your seeds.

    The wool also helps to make the texture of the compost similar to peat – it’s fine and crumbly, which makes it ideal for seedlings, as their shoots can move and grow freely. It has excellent water retention qualities, and won’t dry out as quickly as some of the other composts on this list.

    With 12 litres included in the pack, this is also our largest quantity of seed compost, and could be ideal if you’ve got a lot of seeds to plant, or you just want your compost to stretch further. It’s approved by the Soil Association, so you can be sure you’re getting quality, as well as quantity.

    Ultimately, this is a fantastic, sustainable option for anyone concerned about the negative environmental effects of mining peat for compost. It’s fine, crumbly, and moisture retentive, and perfect for starting off seeds.

    Pros

    • Large 12L bag will last longer.
    • Made from wool and bracken – 100% sustainable.
    • Wool comes from sheep at the Lake District National Park.
    • Peat-free formula is more eco-friendly.
    • Fine texture is ideal for seedlings.
    • Excellent water retention – won’t dry out too fast.
    • Made in Britain.
    • Approved by the Soil Association.

    Cons

    • Compost isn’t designed to expand with water, and the 12L bag is, therefore, larger and heavier than some of the others we’ve featured.

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    This ultra-fine, nutrient-rich compost is ideal for planting cuttings and sowing seeds and can boost plant germination by 25%

    The last option to make it onto our list of the best seed composts is this Gro-Sure Seed & Cutting Compost from Westland. It comes in a 10 litre bag, which is relatively easy to lift, transport and store.

    This compost contains a unique blend of plant extracts, including seaweed, to provide your seeds with all the essential nutrients they need to grow, and mycorrhizal fungi, to help build roots. The manufacture claims that Gro-Sure can improve germination by 25%, compared to standard seed and cutting compost.

    The formula also contains fine-grade vermiculite, which gives it a fine texture that encourages aeration and drainage, and makes it an ideal medium for sowing seeds. It can also be used effectively for planting cuttings.

    A minority of users report lumps of wood in their compost, but these definitely don’t seem to be the norm. If you notice this, we would recommend sieving the compost before use, as a fine texture is desirable when sowing seeds and planting out cuttings.

    Overall, we believe this is another high-quality seed compost, that will provide your seeds with all the nutrients they need, and has the fine texture needed for young shoots and roots to break through – and all for a very reasonable price.

    Pros

    • Contains seaweed, and nutrients essential for healthy plant growth.
    • Boosts germination by 25%, to give your seeds the best start in life.
    • Contains mycorrhizal fungi to help build roots.
    • Ultra-fine texture ensures the compost has excellent aeration and drainage.
    • Small 10 litre bag is easy to lift, transport and store.

    Cons

    • Compost may need sieving before use, to remove any lumps.

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    Seed compost is a compost specifically designed for propagation. It is the recommended type of compost to use when sowing seeds and planting out cuttings, and will give new plants the best start in life.

    This type of compost has fewer nutrients than general garden compost, which can be too rich for seeds. Leaf mould, coir (coconut fibre) and rotted wood chippings are often substituted in place of peat, to achieve the right consistency and drainage for seeds.

    Seed compost is also light and fine in texture, to allow shoots and roots to move freely through it. You can transplant your seedlings into all-purpose compost, once their roots have become established.

    The easiest option when it comes to planting seeds is to purchase a ready-made seed and cuttings compost, such as those we’ve featured here. These composts are specifically designed to meet the nutritional needs of your growing plants. However, if you prefer to try making your own seed compost, there are several ‘recipes’ you can follow.

    One option is to mix equal parts topsoil from your garden and John Innes compost, and then add a handful of Fish, Blood and Bone, and a sprinkling of perlite. Alternatively, you can add an equal amount of leaf mould to your topsoil/compost mix. If you don’t want to use soil, you can also mix two parts compost with an equal amount of coir, and one part of perlite or sand.

    Sieve your mixture to remove any larger pieces, and make sure the seed compost is fine. If you really want to go all out, you can also (carefully) steam your seed compost in a pressure cooker, or heat in the microwave or oven, before planting. This will pasteurise it, and kill any germinating weeds. Store your compost in an airtight container, in a cool, dry location.

    About the author

    April Foot

    April is a freelance writer who specialises in travel, home and garden design, and the environment. She is an avid wildlife-enthusiast and adventure-seeker, and feels happiest when in the Great Outdoors.

    The UK’s Best Seed Compost For Plant Germination Give your seeds the best start in life by planting them in a specialist seed compost, designed to promote germination and healthy growth. Seed

    Compost seed

    Homemade garden compost is usually used to enrich and add organic matter to the soil and it can also be used to make seed and potting mixes. I would recommend that all home composters give making homemade seed and potting composts a try.

    The requirements of a homemade seed of potting compost are the same as for those provided commercially. It should be:

    • free from pests and pathogens (plant and human)
    • moisture retentive while allowing air circulation
    • of a uniform consistency (sieving may be necessary to achiev this)
    • of a texture that will allow root development and support for the seedling
    • and contain sufficient nutrients.

    When making homemade compost mixes only mature i.e. fully decomposed compost should be used and this should be sieved (screened) so that it consists of small particles of a relatively consistent size.

    The cheapest shop option for small quantities is a Seedling Potting Riddle this has a 4mm galvanised mesh sieveto provide a compost for planting seed.

    A hand operated Rotary Soil Sievis a more expensive option which will create a compost, suitable for for Seed and Potting compost. Dry compost from the bin on the seive and the handle is rotated pushing the material through the 2.5cm/1″ x 1.5cm/0.5″ mesh. Both of the above can be purchased from http://www.harrodhorticultural.com and other suppliers.

    While sieves, such as the above, can be purchased it is relatively easy to make a wooden a box frame of a size to fit onto your wheelbarrow. A strong weld mesh base with 6mm holes should be fitted securely to the frame. Remember it will be used quite roughly so make sure that the frame and base are well secured.

    Homemade Seed and Potting Compost – Risks

    Making homemade seed or potting compost using garden compost direct from the bin or wormery for germinating seeds, potting on young seedlings and rooting plants from stem cuttings risks the introduction of weed seeds, pathogens or organisms that may damage tender plants . The same risks exist if untreated soil is used as part of the compost mix.

    It is not necessary to heat treat the garden compost or soil mixtures used for potting on those plants that are almost ready to be transplanted into the garden.

    Oven sterilisation of Compost

    Sterilising the compost or soil in Pyrex dish or metal roasting tray (covered by foil) in a preheated oven at 160C for an hour is an effective means of sterilising the compost. The dish or tray should be filled to a depth of not more than four inches so that the compost in the centre reaches the required temperature. The tray of sterilised compost should be remove from oven and allowed to cool before use.

    Gardening Knowledge at www.gardeningknowhow.com suggest a similar method but using lower temperatures involving baking at 82-93 C. (180-200F) for at least 30 minutes. It is suggested that heating to higher temperatures can result in the production of toxins

    Sterilisation is an effective way of eliminating the risk but it means that everything is killed is including beneficial organisms.

    Heating the garden compost, or soil, at a lower temperature with remove pathogens without damaging nutrients . Motherearth (www.motherearthnews.com/homesteading-and-livestock) suggest a method for the pasteurization of compost so as to destroy harmful organisms but not the beneficial ones. Compost is placed in an aluminium baking pan (I prefer a Pyrex baking tray) again to a depth of 4 inches. A meat thermometer is placed in the compost at centre of the tray, so that it can be read while the tray is in the oven. Pre-heat the oven to 93C ( 200F) and insert the tray. Bake for 30 minutes once the thermometer records a temperature of 71C (160F). Cool the compost before use.

    Sterilizing Compost with a Microwave

    Gardening Know How (www.gardeningknowhow.com) suggest a method of sterilising compost or soil using a microwave. About a kilogram of compost is heated in a microwavable container covered by Clingfilm with added ventilation holes.

    The compost is heated for about 90 seconds per every kilogram (approx 2 pounds) on full power.

    Alternatively a kilogram of moist soil can be microwaved in an open polypropylene bag for 2 to 2 .5 minutes on full power (650 watt oven). The bag is closed and allowed to cool before removing.

    A problem common to all methods involving invading the kitchen is that the sterilisation or pasteurisation will give rise to an earthy smell that may not be popular with everyone in the household. An alternative could be used a propane gas Outdoor Camp Oven.

    Seed Compost

    Seeds contain stored nutrients and will need few additional nutrients to germinate and start to grow , so compost straight from the bin or wormery will be too rich to be used as a seed compost. It will also be of the wrong texture and may not provide adequate drainage.

    While Leafmould has a low nutrient level and could be used as initial seed compost the seedlings would need to be pricked out and transplanted almost immediately after they have germinated to provide sufficient nutrients for future growth.

    It is therefore better to make a seed compost containing just sufficient nutrients to provide for germination and initial growth. Then, as the seedlings grow, and need more nutrients transplant them into larger pot containing a potting compost with a richer mix of nutrients. Potting onto larger pots, may be required several times, increasing the size of the pot gradually, when the roots nearly fill the existing pot.

    In addition to providing nutrients the compost should provide drainage, so that the soil does not become waterlogged and cause the seedling to rot, while retaining sufficient moisture for the plant to grow. It will need to contain air spaces so that soil microbes and the roots will have oxygen while being of an even consistency free from lumps. This favours a light or fine textured mix but it must be sufficiently firm to retain and support the seedling as it grows to a size suitable for potting on. It should also retain its volume in the pot and be free from pest and disease.

    Homemade garden compost is usually used to enrich and add organic matter to the soil and it can also be used to make seed and potting mixes. I would recommend that all home composters give making homemade seed and potting composts a try. The requirements of a homemade seed of potting compost are …