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Tall Ironweed
Vernonia altissima 'Jonesboro Giant'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Vernonia (ver-NON-ee-uh) (Info)
Species: altissima (al-TISS-ih-muh) (Info)
Cultivar: Jonesboro Giant

Category:

Perennials

Height:

6-8 ft. (1.8-2.4 m)

Spacing:

12-15 in. (30-38 cm)

Hardiness:

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:

Sun to Partial Shade

Danger:

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Magenta (Pink-Purple)

Fuchsia (Red-Purple)

Blue-Violet

Violet/Lavender

Purple

Bloom Time:

Mid Summer

Foliage:

Herbaceous

Velvet/Fuzzy-Textured

Other details:

May be a noxious weed or invasive

This plant is attractive to bees, butterflies and/or birds

Self-sows freely; deadhead if you do not want volunteer seedlings next season

This plant is resistant to deer

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

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:

From seed; direct sow outdoors in fall

From seed; stratify if sowing indoors

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Regional

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

Mc Donald, Ohio

Gardeners' Notes:

1
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RatingContent
Positive

On Sep 19, 2010, bobb1047 from McDonald, OH wrote:

i purchased one plant three years ago, tried to grow from the seeds i collected at the end of the year, but only got one plant from seed. replanted the first plants roots and now i have a wonderful & beautiful clump of 10 stems that are over 12' tall. i have people stopping by all the time to ask questions about this very tall, beautiful plant with such a large flowering atop of the stems... i hope to have better luck with the seeds this year... if any one has any suggestions or advice, please let me know.... thank you
bob.