Vernonia Species, Gray Narrowleaf Ironweed

Vernonialettermannii

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Vernonia (ver-NON-ee-uh)
Species
lettermannii (let-ter-MAH-nee-eye)
Synonym
Cacalia lettermannii
Sun Exposure
Full Sun
Foliage
Herbaceous
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)
Bloom Color
Medium Purple
Bloom Time
Late Summer/Early Fall
Mid Fall
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
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
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Regional

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

North Little Rock, Arkansas

Lawrence, Kansas

Chapel Hill, North Carolina

High Point, North Carolina

West Chester, Pennsylvania

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Gardener's Notes:

2
positives
0
neutral
0
negative
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C
Lawrence, KS | November 2015 | positive

Great perennial once established; fine texture looks like amsonia. Winter dried foliage and seed heads look very attractive and hold up m...Read More

R
Downingtown, PA | June 2014 | positive

This not well-know perennial comes from Oklahoma and Arkansas that is also called Threadleaf Ironweed. Does well in southeast PA and prob...Read More

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