My potentillas have gotten scraggly. What is the best way to prune them?
Mature potentillas are often scraggly in appearance. The best way to renew or rejuvenate scraggly potentillas is to prune them back to within 3 to 4 inches of the ground in late winter/early spring (March or early April in Iowa). The shrubs will grow back and quickly develop into attractive plants. For best performance, potentillas should be rejuvenated every 3 to 4 years.