Grow stronger from seed to harvest |
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Give your plants the very best start—and keep them thriving right through the season—with our Carbon Gold composts.
Blended with biochar, Carbon Gold compost helps create the perfect growing environment from day one. Biochar works like a natural reservoir in your soil, locking in moisture and nutrients exactly where your plants need them. The result? Stronger roots, healthier growth, and more resilient plants—whether you’re sowing seeds or planting out young plants.
Using both seed and all-purpose composts as part of your growing routine makes all the difference. Start your seeds in a fine, gentle mix designed for reliable germination, then move your seedlings on into a richer compost that supports steady, vigorous growth. It’s a simple step that helps ensure success at every stage—from first sowing to final planting out.
Better still, both are available with free delivery, and you can save £8 when you choose our handy twin packs, making it even easier to grow with confidence this season.
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"Best seed compost I've used, growing seedlings with beautiful roots." |
"First time trying this in 2025 and i really liked it - so much so that I have already bought it ready for the 2026 sowing season." |
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Specially formulated for sowing, Carbon Gold Seed Compost provides the ideal fine texture for strong, even germination. Enriched with biochar, it helps retain moisture around delicate roots while supporting healthy early development.
Perfect for trays, modules and pots, it gives your seeds the best possible foundation—so you can sow with confidence and watch them thrive.
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1 x 20L Bag £13.99
2 x 20L Bags £27.98 £19.98 |
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"Worth every penny for healthy, strong plants. So much better than the majority of composts." |
"I have used this product for several years and find it is the best compost on the market." |
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Once your seedlings are ready to move on, Carbon Gold All Purpose Compost gives them the boost they need. With added biochar to improve nutrient retention and soil structure, it encourages robust root systems and sustained, healthy growth.
Ideal for potting on, containers and planting out, it helps your plants establish quickly and flourish all season long.
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1 x 20L Bag £12.99
2 x 20L Bags £25.98 £17.98 |
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BioChar is a natural, charcoal-like material made from plant matter, and it’s a clever addition to seed compost. It helps lock in moisture and nutrients, holding them right where young roots can access them, while keeping the compost free-draining and well balanced. BioChar is also highly stable, meaning it stays in the soil for years rather than breaking down quickly. In doing so, it stores carbon long-term, helping to reduce carbon release into the atmosphere. The result is healthier seedlings, steadier early growth, and a compost that’s doing good beyond the seed tray. |
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Free delivery applies to items listed as free delivery on our website, if you add any other items to your order you will be charged our standard delivery fees for these items.
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Email: [email protected] | Phone: 01480 774555 (your standard network charges apply) S E Marshall & Co Ltd. Registered company address: marshalls garden. Alconbury Hill, Huntingdon, PE28 4HY.
Registration number: NI 48629 | VAT number: GB 843914023 | (c) 2022 marshalls garden. All Rights Reserved.
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