Remove Wild Onions, Grass and Other Debris From Periwinkle Plants
How to get wild onions, grass and other debris from periwinkle plants. They are difficult.
Certified GKH Gardening Expert
With the weeds other than wild onion, you can use a broad leaf and grass specific weed killer. But, wild onions are notoriously resistant to herbicides. The best method for getting rid of them is to dig up the clumps.