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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Category:

Perennials

Height:

36-48 in. (90-120 cm)

Spacing:

24-36 in. (60-90 cm)

Hardiness:

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

Danger:

N/A

Bloom Color:

Magenta (Pink-Purple)

Bloom Time:

Late Summer/Early Fall

Foliage:

Herbaceous

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:

Non-patented

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

Regional

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

Sevierville, Tennessee

Austin, Texas

Fort Worth, Texas

show all

Gardeners' Notes:

2
positives
1
neutral
0
negatives
RatingContent
Positive

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

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

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

My information says this is hardy to zone 3.