Erigeron Species, Canadian Horseweed, Fleabane, Hogweed

Conyzacanadensis

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Conyza (kon-NY-zuh)
Species
canadensis (ka-na-DEN-sis)
Synonym
Conyza canadensis
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
Spacing
24-36 in. (60-90 cm)
Hardiness
Not Applicable
Danger
Handling plant may cause skin irritation or allergic reaction
Bloom Color
White/Near White
Bloom Time
Mid Summer
Late Summer/Early Fall
Mid Fall
Other Details
Category
Annuals
Biennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
May be a noxious weed or invasive
Soil pH requirements
Patent Information
Propagation Methods
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
Regional

This plant is said to grow outdoors in the following regions:

Phoenix, Arizona

Morrilton, Arkansas

Chula Vista, California

Gainesville, Florida

Sebring, Florida

Anna, Illinois

Itasca, Illinois

Benton, Kentucky

Brookeville, Maryland

Pinconning, Michigan

Pawling, New York

Battleboro, North Carolina

Pittsboro, North Carolina

Terrebonne, Oregon

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Gardener's Notes:

1
positive
2
neutrals
4
negatives
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S
Pittsboro, NC | July 2019 | neutral

I kind of like this plant. It's a little weedy, but it outcompetes non-native invasives, it's easy to pull, and when I decide to leave it...Read More

A
A
Gainesville, FL | December 2018 | negative

Next to sandspurs, my second most hated weed. Do not pull with bare hands! The stem and leaf hairs are spines that embed in your skin and...Read More

L
Gerald, MO | March 2015 | neutral

just found out this is useful in ulcerative colitis/ referenced in Michael moore and Micheal Alfs

T
Leesburg, FL (Zone 9b) | July 2009 | negative

I pull this plant out by the bushel full every year... it just keeps coming back. Only good thing is, it's easy to pull out, even in my ...Read More

M
M
Benton, KY (Zone 7a) | January 2005 | negative

This weed has an amazing ability to flourish and set seed in just about any conditions.

It ranges from nearly 10 feet tall...Read More

X
X
Sebring, FL (Zone 9b) | November 2004 | negative

Can we accept that some weeds have little to no garden value? I think this is one of them. I find it growing abundantly only in disturb...Read More

C
ft. worth, TX (Zone 8a) | October 2004 | positive

Grows well without human intervention. Best planted as a group.

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Featured
Beetle
(Harmonia axyridis)
Australasian Pipit
(Anthus novaeseelandiae)