What Spray Kills Periwinkle

Triclopyr mixed with mineral oil is effective but applications will need to be repeated as straggler plants crop up. Getting rid of periwinkle generally takes several seasons no matter what method you choose because of its hardiness and tenacity.

What is the best way to kill Periwinkle?

Cut the vinca with a lawn mower or trimmer and immediately apply a 5 percent solution of glyphosate to the cut foliage and stems. This best done in spring or fall when vinca is actively growing and temperatures are between 70 and 80 degrees Fahrenheit.

Does Roundup kill Periwinkle?

Even the makers of Roundup, an herbicide that biodegrades within a week, advise against its use on Vinca.