should I cover periwinkle with leaves for winter

Question

Periwinkle planted this year in 20 x 20 area, part shade protected from the north. After last year’s freeze, I thought I’d cover the periwinkle now with leaves as a winter cover. Is that a good idea? When should I uncover?

Answer 1

Yes, you can add about 4 inches of organic loose mulch such as leaves to winterize the Periwinkle ground cover.

Uncover your plants in the spring when the danger of frost has passed.

https://www.gardeningknowhow.com/ornamental/groundcover/periwinkle/growing-periwinkle.htm