iGrow Carpet Winter Ready Pro 6-8-10 + 4% MgO + 2% CaO A feed built for the cold months. As the soil cools, the last thing your lawn wants is a big hit of nitrogen pushing out soft, leafy growth, because that's exactly the growth that gets battered by frost and picked off by disease. This does the opposite. It toughens the grass up and keeps colour through winter. Iron-free, so no orange staining on paths or drives. Safe for kids and pets when used as directed. The science bit Nitrogen (6% N): Kept low on purpose. Just enough to hold colour over winter without forcing the soft top growth that struggles in the cold. Phosphorus (8% P): Feeds root development. Top growth slows right down in winter, but roots keep working away below the surface, and a stronger root system now sets the lawn up for spring. Potassium (10% K): The one doing the heavy lifting here. It strengthens the plant's cell walls and improves tolerance to frost, cold and disease. In plain English, it's the grass equivalent of putting a coat on before heading outside. Magnesium (4% MgO): Sits at the centre of the chlorophyll molecule, which is what keeps grass green. It holds colour through the dull months when most lawns go pale. Calcium (2% CaO): Adds to that cell-wall strength and helps the other nutrients work efficiently rather than getting locked up in the soil.