I've had good results just digging some up by the roots and transplanting them. I watered them a little the first few weeks and they took off. Have now spread to cover a large area, mostly shaded. I did the transplanting in mid spring.

Thanks for your help! I just realized that leaves will fall all over where I planted the periwinkle..I normally let the leaves remain in the beds. But with the periwinkle will this be a problem. Will leaves kill the periwinkle during the cold winter months or will it be fine. Thanks so much.

I have periwinkle spreading through the woods around here/ If anything, the leaves protect it from the cold and makes it thrive. I wish fallen leaves killed it. I wish.

Periwinkle is considered an invasive plant here. It roots very readily by layering. Once a stem touches the ground, it pulls roots!