What happens below the soil is just as important as what you see above it. GT Rootzone is an organic-based root biostimulant packed with marine and plant extracts, fulvic acid, amino acids, thiamine, and potassium — all working together to give your plants' roots an unbeatable boost. Healthy roots mean better nutrient uptake, stronger growth, and improved resistance to root rot, pests, and environmental stress. Use it from cuttings right through to mature plants, and expect to see the difference above ground too. Best used alongside your regular GT Focus fertiliser every time you water. A little goes a very long way — one 250ml bottle makes up to 500 litres of solution. Dilute 0.5ml per litre for cuttings and seedlings, and 1ml per litre for juvenile and mature plants.