Viewing post #931585 by JRsbugs

The easiest and best way to get rid of it (assuming you want to as it has it's uses in the right place) is to pull it up, the stolons are shallow rooted. You might have to keep a watch on it to pull any further growths out. If you use other destructive methods you might be damaging native plants (or insects), if there is any.

Under MANAGEMENT CONSIDERATIONS

Periwinkles are popular ornamental groundcovers [10,37,68]. Their establishment in North America is largely due to their escape from cultivation [29,42,50,51,55,92,97,100,103,107]. Common periwinkle is easily propagated by cuttings [66]. Common periwinkle was planted for erosion control near Washington, DC [37]. Periwinkles are valued medicinal herbs (reviews by [7,81]), and common periwinkle is considered an aphrodisiac (review by [81]).

http://www.fs.fed.us/database/...