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Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Common Name: slender mountain mint

Densely branching with fine foliage and white flowers atop terminal clusters, this Pycnanthemum tenuifolium, or slender mountain mint, has a more delicate appearance than P. muticum but with all the same pollinator action. Like its mountain mint brethren, P. tenuifolium spreads generously by rhizome making this plant a wonderful mass of white blooms in late summer. 

Height: 20-30 in
Spread: 12-24 in
USDA Hardiness Zone: 4-8