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I have a St Augustine/Centipede mix lawn and have struggled with Lespedeza (aka Japanese clover) for years. I’ve tried both atrazine and 2,4-D treatments in the past, but it’s still present in the same areas year after year. Please, does anyone have experience with it and know how to kill it?

Have you tried watering it after applying atrazine? In this way, it will affect the seeds and emerging weeds.