Conoclinium coelestinum, Blue mistflower

Blue mistflower
Conoclinium coelestinum, Eupatorium coelestinum

Hardiness: Zones 5 to 9
Plant type: Herbaceous Perennial
Height: 1.5- 3'
Spread: 1.5- 2.5'
Sun: Part shade to full sun
Water: Medium to wet
Bloom time: September, October
Bloom color: Blue
Soil: Moist, organically rich soils, Prefers moist, fertile, humusy soils which do not dry out., Neutral (≈7)

Notes: Can spread aggressively by rhizome.

More information on this plant here.