Monster Soil Concentrate is a concentrated living soil in a 50 L bag. It is too strong to plant in directly – you mix it 1:1 with an organic soil to create a fully pre-fertilised living soil.
Made from: raised bog peat and sphagnum, worm castings, coconut fibre and perlite, with an organic-mineral NPK fertiliser and lime for pH balance.
Added microorganisms: mycorrhiza, Trichoderma spp. and other beneficial fungi.
Mix Monster Soil Concentrate 1:1 with an organic soil, for example Supreme AllMix or Supreme LightMix.
Example: 50 L Monster Soil Concentrate + 50 L AllMix = 100 L ready-to-use living soil.
Use at least 11 litres of mixed soil per plant.
Pre-grow seedlings in grow plugs. To help young plants adjust, make a planting hole with about 0.5 L of LightMix as a buffer zone and place the young plant in it.
Loosen the used soil and mix in 3–4 L of fresh Monster Soil Concentrate for every 10 L of used soil.
| Net volume | 50 L (EN 12580) |
| Organic matter | 28% (of net mass) |
| pH (CaCl₂) | 7.4 |
| Salinity (KCl) | 6.0 g/l |
| Nitrogen (N) | 400 mg/l |
| Phosphate (P₂O₅) | 1,800 mg/l |
| Potassium oxide (K₂O) | 1,200 mg/l |
| Magnesium (Mg) | 900 mg/l |
| Sulphur (S) | 1,700 mg/l |
Storage: keep cool and dry, protected from the weather. Reseal opened bags. If stored for a long time, check nutrients, pH and salt content before use.
For hobby and horticultural use only.
Prefer a ready-to-use option? See the Monster Soil Pot guide. New to living soil? Start with What is living soil? More questions: Monster Soil FAQ.
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