Lawnporn Green Light is specifically formulated with a high balanced Nitrogen and added Iron to give your lawn a deep green. Use during growing season for best results and this is suitable for all grass types. The Nitrogen and Iron assist with the upper plant health and works best applied to healthy lawn that for example, has been treated with Launch and recovered (from injury, stress or renovation practices). For too long, professional strength products have been out of reach for domestic Lawnie's because you have to buy in bulk. We at Lawnporn thought that unfair and have packaged it a handy 5L container at a reasonable price. Lawnporn Green Light is the exact professional product that professionals use.