Pycnanthemum tenuifolium

Plant in well-drained soil, in full sun or light part shade. Space plants 45 to 60 cm apart. Adding compost at planting improves establishment. Water regularly the first season to encourage rooting, then let the soil dry slightly between waterings. Once established, this perennial will tolerate dry spells well and need little care.

Prune lightly after flowering to keep a compact shape and stimulate branching. Cut back to the ground in late fall, or in early spring before growth resumes. No disease or pest treatment is generally needed. This mountain mint self-seeds naturally and can be divided in spring.