i have a question about getting rid of vines without killing my shrubs... i have roughly 20-25 piney bushes as well as an assortment of tulips, daffodils, daises, and other flowers that line the length of my driveway. in the consecutive summers that we've lived here they've become overgrown and choaked out with vines. both my husband and i weed them out every weekend (weather permitting), but short of weed and feed, etc (which we've tried and failed at), what else is there to do? are there any other products out there that will prevent or even slow the growth of the vines??