I've tried spraying Roundup for Poison Ivy and Brush on my vinca twice in the past week and it's not even wilting. I used a blue dye to be certain I thoroughly coated the surface of the plants. Any ideas?
Roundup works best on things actively growing, and must be used heavily enough. If it doesn't get all the vinca, Crossbow will. It's meant for broadleaf plants only, it lets grass live.
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