Hoary Mountainmint

Description

Pycnanthemum incanum grows to 2 to 4 feet (0.6 to 1.2 m) high by 4 feet (1.2 m) wide. The stems are covered with a soft, whitish down. A vigorous and often aggressive grower, this plant spreads by long rhizomes. White blooms appear from July to September. Pycnanthemum means "dense flower-clusters" in Greek, and the flowers are favored by butterflies, moths, and some species of wasps.