Silic Rock is a silicium fertiliser that helps your plants fight a hidden problem: silicium deficiency. Silicium improves the uptake of nutrients essential for your plants, such as phosphorus, calcium, and micronutrients. Silic Rock contains silicium in a form easily taken up by the plant, strengthening the cell walls and improving resistance to pests and disease. This nutrient is not suitable for hydroponic growing systems. If you use an irrigation system, flush the pipes after use.