Appalachian Mountain Mint has attractively fragrant foliage topped by spiky round silvery white flowers in late summer. The blooms are highly attractive to butterflies. Since Pycanthemum flexuosum spreads by underground stolons, it does a good job on slopes and stream sides. The fall foliage color takes on shades of red for added interest. This fragrant native is adaptable to many different site conditions and is the larval host for the grey hairstreak butterfly, whose caterpillar stage has a symbiotic relationship with ants, making this species doubly important for natural ecological processes. Very deer resistant.