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Learn more about Poast Herbicide
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Poast Herbicide is labeled to be used on asparagus as directed on the label and would not harm it.
Poast is actually a grass killer, so it would not be safe to use on centipede or St. Augustine grass.
Poast Herbicide can be used on collards, but it does not control sedge or broadleaf weeds. Your best option would be to pull them up or spot treat with a nonselective such as RoundUp QuikPro.