Rapid Response & Long Term Feeding for Lawns & Turf Robust Lawn Booster is a professional grade controlled release fertiliser designed specifically for lawns Robust Lawn Booster provides steady strong growth for up to 4 months from application. For best results, apply in spring, summer & autumn. Creates extra thick green lawn, helping to block out weeds. Ideal as lawn starter fertiliser. Provides superior, professional results – out performing traditional fertilisers. Every granule contains the same nutrients, giving more even and robust growth. NPK: 22 : 1.3 : 5.8 COVERAGE: 4kg – 265m2 Established Lawns (530m2 Lawns less than 8 weeks old). 8kg – 530m2 Established Lawns (1060m2 Lawns less than 8 weeks old). SKU: ROBLB4 Not covered by flat rate shipping. Request a quote for more information