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PlantFiles: Croftonweed, Eupatorium, Sticky Snakeroot
Ageratina adenophora

 
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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Ageratina (ad-jur-uh-TY-nuh) (Info)
Species: adenophora (ad-eh-NO-for-uh) (Info)

Synonym:Eupatorium adenophorum

Category:
Perennials

Height:
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

Spacing:
24-36 in. (60-90 cm)

Hardiness:
Unknown - Tell us

Sun Exposure:
Sun to Partial Shade

Danger:
Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Spring

Foliage:
Herbaceous

Other details:
May be a noxious weed or invasive
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Non-patented

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow after last frost

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By kennedyh
Thumbnail #1 of Ageratina adenophora by kennedyh

By kennedyh
Thumbnail #2 of Ageratina adenophora by kennedyh

Profile:

No positives
No neutrals
2 negatives

Gardeners' Notes:

RatingAuthorComment
Negative caron On Nov 25, 2004, caron from Woodland Park, CO (Zone 4b) wrote:

U. S. FEDERALLY LISTED NOXIOUS WEED.
Not allowed for import to the US and not allowed in any interstate or intrastate transportation without a specific permit from USDA APHIS PPQ (Plant Protection and Quarantine).

Negative Terry On Jan 21, 2003, Terry from Murfreesboro, TN (Zone 7a) wrote:

This plant escaped cultivation, and has become an invasive weed problem. It disperses thousands of seeds, which will quickly establish in any bare area. It requires light to germinate, but once established, it will tolerate a fair amount of shade. Often confused for its close relative, Ageratina riparia (Mistflower), the flowers are very similar, but the plants can be distinguished by their habit - A. adenophora is taller and upright, while A. riparia sprawls, reaching a maximum height of 1 ft/30 cm. Their leaves are also different, Croftonweed having broad-toothed leaves (vs. narrow, elongated toothed leaves of Mistflower.)



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