Photo by Melody

PlantFiles: Gray Narrowleaf Ironweed
Vernonia lettermannii

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Vernonia (ver-NON-ee-uh) (Info)
Species: lettermannii (let-ter-MAH-nee-eye) (Info)

One vendor has this plant for sale.

2 members have or want this plant for trade.

Category:
Perennials

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

Spacing:
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)
18-24 in. (45-60 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)
USDA Zone 9a: to -6.6 C (20 F)

Sun Exposure:
Full Sun

Danger:
Unknown - Tell us

Bloom Color:
Purple

Bloom Time:
Late Summer/Early Fall
Mid Fall

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
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:
From herbaceous stem cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By Rickwebb
Thumbnail #1 of Vernonia lettermannii by Rickwebb

By Rickwebb
Thumbnail #2 of Vernonia lettermannii by Rickwebb

By Rickwebb
Thumbnail #3 of Vernonia lettermannii by Rickwebb

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive Rickwebb On Jun 28, 2014, Rickwebb from Downingtown, PA wrote:

This not well-know perennial comes from Oklahoma and Arkansas that is also called Threadleaf Ironweed. Does well in southeast PA and probably does well over much of the East and Midwest in any good quality soil, sort of acid to sort of alkaline. The plant looks good.

Regional...

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

North Little Rock, Arkansas
High Point, North Carolina
West Chester, Pennsylvania



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