Hairy mountain mint (Pycnanthemum verticillatum var. pilosum) is a tough, aromatic perennial that brings clouds of nectar-rich, white to pale lavender blooms to your garden in mid to late season.
You will love it in pollinator plantings: the flowers draw a wide range of beneficial insects, and the strongly mint-scented foliage adds texture and fragrance even when the plant is not in full bloom. The leaves and stems are notably hairy, giving the plant its soft, fuzzy look and its common name.
Plant it in full sun for the best flowering, and it will also perform well in part shade (especially where summers are hot). It adapts to many soil types as long as drainage is decent, and once established it can handle dry spells. Mature size is typically 12-36 inches tall, with a spread that can range from about 12 to 36 inches depending on conditions.
This mountain mint spreads by rhizomes. If you want to keep it in bounds, you can cut back or slice the outer roots in spring, or grow it where it has room to wander. Use it in meadows, naturalized areas, slopes and banks, and mixed borders where its airy flower clusters can weave between neighboring perennials.