Answer: Crown vetch is now considered to be a noxious weed in many areas because it is invasive and difficult to control. Unfortunately, many plants that are commonly used as groundcovers because they spread quickly are now out of favor (and some are banned outright) because they escape from cultivation and crowd out native species.
If the area isn't too large, I would consider tamer plants. Phlox is one option but it needs reasonably moist soil; you could also try daylilies or yarrow, or creeping juniper. If the area is large and out of view, you might leave it alone to provide habitat for wildlife.
Q&A Library Searching Tips