What ever it is called, It does like wet moist ground. I have a septic system and does like that area. It will kinda die back over the winter months but it will come back and the mid summer is when you will notice it the most. It probably came to your yard from your mower guys. The Pre Emergent comment you received it spot on. Round up now sells weed killer that is made to put on St Augustine Grass and will NOT kill the grass only the weed. You may want to give it a try. Good Luck
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