weeds in the groundcover quaestion

I have a fairly large area with Vinca groundcover (aka myrtle or periwinkle) that was planted almost 2 years ago. Problem is there are numerous weeds that have taken root in the same area. I am unable to keep up with the weeding, which is quite difficult because the weeds are tightly mixed in with the groundcover. My question is...is there a chemical (herbicide) that will kill the weeds, but not harm the groundcover. Thanks.

Don't know of a herbicide that would work as an overall spray....Look at your farm supply and try to find one of those wick applicators that looks like a PVC golf putter....a little roundup in the handle and wipe them weeds out!!!!

GareyD

Thanks for the suggestion...I will look into it.