Hello, I have a couple of lawn service customers who are asking us to handle their lawn fertilization. Would anyone be willing to share how they set up their annual fertilization programs? I am considering applying atrazine to both of these lawns which are both St. Augustine. I know not to apply atrazine in the dead heat of summer. What is the earliest (month) and latest (month) of the year atrazine can be safely applied? Keep in mind that I am in South Louisiana. Also, do you include tree and/or shrub fertilization? Do you typically do all the trees on the property (assuming they are worth fertilizing) or only the trees near the house or customer option? Thanks.