Wild Ageratum or Blue Mistflower (Conoclinium coelestinum or Eupatorium coelestinum) is an Eastern native plant. It is in the aster family and blooms from mid-summer through mid-autumn. It prefers full to part sun and is hardy to USDA Zones 5 to 10.
This plant has an annual look-a-like – the short bedding plant Ageratum (Ageratum houstonianum). It is also a close relative of Common Boneset (Eupatorium perfoliatum) and is known alternatively as Blue Boneset.
Wild Ageratum likes moist, fertile soils and can spread aggressively. It is easy to pull out the rhizomes though and if reseeding is a concern, remove the spent flower heads before they go to seed.
It can grow to 2 to 3 feet tall. To prevent flopping and prolong the bloom
period, taller plants may be cut back in summer.
Pollinators are fond of it and deer seldom trouble it.
Wild Ageratum is hard to find at the garden center, but you can try native
plant sales or ask for a springtime division from a gardening friend.
Wild Ageratum - You Can Grow That!
Visuals by Nicole Noechel
Audio by Kathy Jentz
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