In San Antonio on my St Augustine lawn, I apply ordinary corn meal (not corn gluten meal) on Washington's Birthday, Memorial Day, 4th of July, Labor Day, and Thanksgiving. Your mileage and enthusiasm may vary, but summer heat has no impact on organic fertilizing. You cannot burn your lawn by applying grain type fertilizers in high amounts.
Just an added note, there is a lawn forum farther down in the list where many lawn questions are already asked and answered.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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