Dr. Chris Marble has done some work looking at controlling this weed with pre and post herbicides in ornamental crops. Here are some pictures of the work that he shared with us at the Woody Ornamental Production Field Day at Balm and will be published in this year's Proceedings of the Florida State Horticulture Society.
Here are the results of the post-emergent herbicide treatments 5 weeks after treatment (WAT). You may need to click on the pictures in case they aren't displaying correctly.
Here are the results of the pre-emergent treatments 8WAT