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Ageratum

Conoclinium coelestinum, commonly called mistflower, is a late summer to fall-blooming herbaceous perennial that is native to the Eastern United States. It looks like annual ageratum and in that regard is sometimes commonly called hardy ageratum. But it is perennial and can spread aggressively by rhizomes. It typically grows to 1-2’ tall on downy purplish stems clad with coarsely-toothed, ovate-deltoid leaves (to 3” long). Numerous small, fluffy, tubular, blue-purple flowers (to 1/ 2” across) with discoid heads bloom from July to October in dense flat topped terminal clusters (corymbs). Mistflower is primarily found in low wet woods, at bluff bases, and in moist ground along streams, ponds, sloughs and ditches. It is also commonly called blue boneset.

Photo: Wikimedia Commons | User: Kingdon

Larval Host for the

Little Yellow Butterfly

1.5-3'

1.5-3'

SIZE

SOIL

Moist Loam, Clay, Sand

LIGHT

Part Shade, Sun

BENEFITS

Bees, Butterflies, Moths, Beetles

NOTES

Prefers moist, fertile, humusy soils which do not dry out. Will grow in wet areas.

CHARACTERISTICS

Spreads Quickly, Groundcover, Stabilizing, Showy, Will Naturalize

July, August, September, October

Flower

This 

flowers in

Blue Mistflower

Conoclinium coelestinum

DETAIL VIEW

DESCRIPTION

Conoclinium coelestinum, commonly called mistflower, is a late summer to fall-blooming herbaceous perennial that is native to the Eastern United States. It looks like annual ageratum and in that regard is sometimes commonly called hardy ageratum. But it is perennial and can spread aggressively by rhizomes. It typically grows to 1-2’ tall on downy purplish stems clad with coarsely-toothed, ovate-deltoid leaves (to 3” long). Numerous small, fluffy, tubular, blue-purple flowers (to 1/ 2” across) with discoid heads bloom from July to October in dense flat topped terminal clusters (corymbs). Mistflower is primarily found in low wet woods, at bluff bases, and in moist ground along streams, ponds, sloughs and ditches. It is also commonly called blue boneset.

Photo: Wikimedia Commons | User: Kingdon
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