Can weedbgone be used to kill annual weeds in a bed planted with vinca minor?
No. Weed-Be-Gone can't differentiate between what are weeds and what are cultivated plants. This product is used primarily to control broadleaf weeds in lawns. There are not really any weed killers that can be used among groundcovers to kill broadleaf weeds without harming the groundcovers as well. Your best bet is to hand weed, then apply a pre-emergent (like Preen) and/or mulch. If you have grass weeds coming up, you can use Grass-Be-Gone but it will not have any affect on broadleaved weeds, only grasses.
thanks. I started weeding today. what a mess.