http://www.greensidelawncare.com Call 314.479.4005 for a quote and FREE Scott's 4 Step Fertilizer Program for new customers. Many Saint Charles Lawncare customers of mine ask me the when it is the best time to fertilize the lawn? Yes there is a right and wrong time for fertilizing & aeration in the Saint Peters, Chesterfield, and Saint Charles area. If you do it at the wrong time your grass could snap and die.