Starting plants from seed is one of the most rewarding parts of gardening, but success depends heavily on using the right growing medium. Unlike general-purpose options, sowing compost is specially formulated to support the delicate early stages of plant growth, providing a fine texture, balanced moisture, and just enough nutrients to encourage strong root development without overwhelming young seedlings.
What is it?
Sowing blends are low in nutrients and finely graded to promote healthy germination and root growth. Seeds contain all the energy they need to sprout, so too much feed can damage or “burn” young roots. That’s why these specialist options typically have a fine, crumbly texture to allow for good drainage and air circulation.
Why choose a specialist blend?
Using multi-purpose compost may seem convenient, but it often contains too many nutrients and a coarse texture that’s not ideal for tiny roots. These finer mixes:
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Reduce the risk of damping-off disease
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Encourage faster germination
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Support healthy root development
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Make transplanting easier
Westland Seed & Cutting Compost
One of the most popular options for gardeners across the UK, Westland Seed & Cutting Compost is specially developed for both sowing and rooting delicate cuttings.
Key features:
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Fine texture is ideal for small seeds
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Balanced nutrient content to support early growth
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Contains perlite for aeration and drainage
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Promotes strong root development in seedlings and cuttings alike
This compost is a great all-rounder, whether you’re growing annual flowers, vegetables, or propagating softwood cuttings.
John Innes Seed Compost
The traditional choice for sowing, John Innes Seed Compost is a classic loam-based blend that has stood the test of time. Its reliable formulation offers just the right environment for early plant development.
Key features:
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Loam-based mix for improved moisture retention and structure
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Low nutrient content to protect sensitive roots
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Contains sand for drainage
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Ideal for sowing in pots, trays, or modules
John Innes is a go-to for gardeners who prefer a soil-based medium and consistent results.
How to use it?
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Fill clean seed trays or pots with a fresh, fine-grade mix – avoid reusing old material.
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Level and firm gently – don’t compact it too much.
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Sow seeds according to packet instructions — fine seeds may just need a light covering.
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Water gently with a fine rose or mist to avoid displacing seeds.
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Cover with a propagator lid to retain humidity until germination.
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Place in a bright spot but out of direct sunlight.
Final Tips for Sowing Success
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Always label your trays — it’s easy to forget what you’ve planted!
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Keep the growing medium moist, not soggy — good drainage is key.
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Use fresh material each season for best results and to avoid disease.
Choosing the right compost for sowing can be the difference between strong, healthy seedlings and disappointing results. Whether you opt for the versatile Westland Seed & Cutting Compost or the time-tested John Innes blend, you’ll be giving your seeds the best start in life.
