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PlantFiles: Ironweed
Vernonia fasciculata

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Vernonia (ver-NON-ee-uh) (Info)
Species: fasciculata (fas-sik-yoo-LAH-tuh) (Info)

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36-48 in. (90-120 cm)

24-36 in. (60-90 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Sun to Partial Shade


Bloom Color:
Magenta (Pink-Purple)

Bloom Time:
Late Summer/Early Fall


Other details:
Average Water Needs; Water regularly; do not overwater
This plant is attractive to bees, butterflies and/or birds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

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2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive cedar18 On Oct 10, 2010, cedar18 from Lula, GA (Zone 7b) wrote:

The plant bloomed well but was too far in the back of the border. So I dug it up to divide it -- and what a job! It was very well rooted after two years, and I had to saw the rootball apart. There was no other way to divide it.

Positive MN_Darren On Sep 9, 2008, MN_Darren from Saint Paul, MN wrote:

I've had it for three years. Not only is it really beautiful, it's also very tough, maintaining attractive foliage until the frost. August is bloom time, and it must be deadheaded in order to prevent the airborn seeds launched from their 6-7 foot platforms from covering the neighborhood. It is native to this area, and not outrageous in its water demands. It is a very logical companion to tall perennials like Joe Pye Weed, which it compliments nicely, which has similar demands. The only negative I have seen is really a matter of taste--do you need a 6-7 foot-tall, late summer deep purple, asterlike plant with really nice foliage and reseeding?

Neutral Gabrielle On Jun 2, 2006, Gabrielle from (Zone 5a) wrote:

My information says this is hardy to zone 3.


This plant has been said to grow in the following regions:

Vincent, Alabama
Marion, Arkansas
Pensacola, Florida
Lula, Georgia
Chicago, Illinois
Hinsdale, Illinois
Greenville, Indiana
Iowa City, Iowa
Yale, Iowa
West Monroe, Louisiana
Crofton, Maryland
Saint Paul, Minnesota
Elizabeth City, North Carolina
Norman, Oklahoma
Oklahoma City, Oklahoma
Pocola, Oklahoma
Wilkes Barre, Pennsylvania
Austin, Texas
Fort Worth, Texas

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