Fertilizer burn occurs when you apply too much fertilizer to your lawn. If this happens water, water, water as soon as possible for a few days after the application. If the grass plant is lying down, it is probably dead. If it is standing, there is a chance to save it. Remember – the recommended rate is the recommended rate, it is not a suggestion. NEVER apply traditional fertilizer when temperatures are above 85° or if high humidity is present. This may also cause fertilizer burn. Organic Lawn Fertilizer, Love Your Soiland Mag-I-Cal will not cause fertilizer burn if applied in the heat or humidity. Grass that has been burned by fertilizer generally has a yellowish hue to it.