Our 2 in 1 lawn thickener has a unique blend of fast-acting grass seed and lawn feed to thicken and restore your lawn. It contains Nitrogen for a greener and healthier lawn and Phosphorus for strong, healthy root growth. When to apply: From February to September (when there is adequate warmth in the ground of at least 6-8 degrees celsius. Application rate: 35g of Wilko 2 in 1 lawn thickener covers 1 square metre. Wilko 2 In 1 Lawn Thickener 1.7kg Granular Lawn Feed & Grass Seed