When applying Lawn Fertilisers, it is important to follow the manufacturer’s instructions and apply it evenly over the lawn. Over-fertilizing can lead to excessive growth, which can weaken the grass and make it more susceptible to disease and pests. Additionally, standard Fertilisers should not be applied during periods of drought or extreme heat, as it can burn the grass. Lawn Rules Lawn Fertilisers in fact do not burn grass and we can prove this.