My Potentilla has leaves that have brownish spots appearing on its leaves. Any ideas?
A. Potentilla are susceptible to few leaf spot diseases and mildew but rarely are they a serious threat to the plant. Potentilla should thrive in sun to light shade. Many flowering shrubs become less vigorous and ragged as they become overgrown. Pruning may help to rejuvenate it. You could prune a third of the largest branches by cutting them back to the ground, or prune all branches back heavily (to the ground) late next winter. More on Minimum Effort Ornamentals.
