I had a customer call me in a mild panic because I put 19-0-6 fertilizer and .1% Dimension on his grass today that was newly seeded in parts of his lawn late last fall, about Oct 15. His landscaper gave him some starter fertilizer and he put that on two weeks ago. His landscaper said apply no chemicals or pesticides in spring. It looked fairly good. Has not needed mowing yet. What will happen? How soon can you treat new grass? Has anyone ever killed new grass from applying crab preventer too soon? Actual personal experience.