Plant Magic Plus Soil Supreme 40 Litres — Premium Peat-Based Potting Soil with Organic Growth Stimulants
Best for: Growers wanting reliable, light-airy soil that works from seedlings through to harvest without the guesswork
Our thoughts
This is a proper soil that's been trusted for years for good reason. Fluffy texture, roots love it, and the fytocell foam does something perlite can't — roots actually grow through it rather than around it. One we sell a lot of because it just works, and growers get consistent results without faffing about.
Plant Magic Plus Soil Supreme is a premium peat-based growing medium supplied in 40 litre bags, designed for growers who want quality, consistency, and simplicity. It's a blend of Irish sphagnum peat, fytocell foam technology, and Plant Magic's own organic growth stimulant — all mixed to create soil that's light, airy, and ready to use straight out of the bag. The result is a potting soil that handles everything from tiny seedlings to full-cycle growing without burning roots or leaving you second-guessing your feeding schedule.
How it compares
Soil Supreme sits in the premium mid-range of peat-based potting soils.
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vs. Budget multi-purpose compost: Far more airy, better drainage, organic growth stimulants included — you're paying for consistency and performance
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vs. Plagron Light Mix: Soil Supreme gives you 6 weeks of pre-nutrition; Light Mix has only 1 week. Plus, fytocell foam lets roots grow through the aeration material, not around it like perlite does
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vs. BioBizz All Mix: Soil Supreme is lightly fertilised (safer for seedlings); All Mix is heavier on nutrients (better for established plants mid-cycle)
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vs. Peat-free alternatives: Soil Supreme is peat-based Irish sphagnum, so if you're comfortable with that, you get proven consistency over newer products
The real difference is the fytocell foam. It's an open-cell structure that holds air like a sponge, meaning roots can actually use more of your medium rather than working around it.
Usage guidance
Soil Supreme works across the entire growing lifecycle:
Seedlings and cuttings
Low EC (1.2) means no burn risk when potting rooted cuttings or sowing seeds directly. The 6 weeks of built-in nutrition covers the first 2–3 weeks of growth easily, so you can feed lightly or hold off entirely if you prefer a gentle start.
Vegetative growth
Use as your main medium through veg stage. Fytocell foam keeps the soil airy and well-draining — water regularly but allow free drainage. Don't let it sit waterlogged.
Full-cycle growing
No need to swap mediums. Pot straight into Soil Supreme and run it to harvest. The light fertilisation means you're in control — add nutrients on your schedule, not the soil's.
Nutrient compatibility
Designed to work with Plant Magic's own 'Oldtimer' (organic) and 'Soil' (mineral) ranges, but works equally well with any standard soil-base nutrient line. The low starting EC gives you room to add whatever feed you choose.
Watering
Water regularly and allow drainage — this is a peat-based soil, so it holds moisture well. Don't oversaturate. The fytocell helps retain water without becoming compacted, which is a common problem with standard peat mixes.
Technical specifications
- Volume: 40 litres per bag
- Composition: Black and white sphagnum peat (Irish sourced), fytocell foam (7–10%), organic growth stimulant
- Fytocell structure: Open-cell substrate, 60/40 water-to-air retention ratio; holds approximately 40% air regardless of environment
- Pre-fertilisation: Up to 6 weeks of nutrition included; suitable for first 2–3 weeks of growth without additional feeding
- EC: 1.2 mS/cm (low EC, safe for young plants)
- Texture: Light, fluffy, minimal compaction
- Additives: Prehistoric organic growth stimulant (extracted from naturally decomposed plant and animal remains — beneficial for fungi and microorganisms)
- Suitable for: Organic and non-organic growers
Who this is for
- Growers moving from budget multi-purpose compost to proper growing soil for the first time
- Anyone growing from seed or cuttings who wants zero burn risk
- Growers wanting a single soil that handles the entire growing cycle without medium swaps
- Users of Plant Magic nutrient ranges looking for matched-system performance
- Experienced growers after consistent quality they trust — this one has proven track record over years
- Anyone frustrated with perlite-based soils compacting down; fytocell doesn't compact the same way
Not for growers committed to peat-free or living soil methodologies — this is traditional peat-based, though the organic growth stimulant adds biological benefit.
Our take
This is a solid, proven growing soil that's earned its reputation honestly. The fytocell foam is a genuine technical advantage — roots do grow through it, which means more of your medium actually works. The pre-nutrition takes the anxiety out of early-stage growing, and the light EC makes it safe for delicate plants without being underfed.
If you're after premium potting soil that just does the job consistently, this is worth picking up. Growers have been buying this for years because it works, and that's recommendation enough. Good time to buy while stock lasts.
