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Bransford, W.D. and Dolphia
Ageratina altissima var. altissima
Ageratina altissima (L.) King & H. Rob. var. altissima
Synonym(s): Ageratum altissimum, Eupatorium rugosum, Eupatorium rugosum var. chlorolepis, Eupatorium rugosum var. tomentellum, Eupatorium rugosum var. villicaule, Eupatorium urticifolium var. tomentellum
USDA Symbol: AGALA
USDA Native Status: L48 (N), CAN (N)
An erect, much-branched perennial up to 4 ft. tall. Large, opposite, pointed-oval leaves. Flowers are tiny, pure white, and in flattish clusters near the top of the stalk.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: White
Bloom Time: Aug , Sep , Oct
, WV Canada: NB
, SK Native Distribution:
Eastern Canada to Sask., s. to WV,
& e. TX Native Habitat:
Rich woods; thickets; clearings; shady river bottoms
Growing ConditionsLight Requirement: Part Shade , Shade
Soil Moisture: Moist
Soil pH: Circumneutral (pH 6.8-7.2)
Soil Description: Rich soils.
Conditions Comments: Spreads by seed and can become weedy.
BenefitConspicuous Flowers: yes
PropagationDescription: Sow seeds in the fall and plant thickly as germination is usually low. Vigorous portions of mature clumps can be divided in spring or fall.
Seed Collection: Not Available
Seed Treatment: Not Available
Commercially Avail: yes
Record Last Modified: 2012-12-07
Research By: TWC Staff