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PlantFiles: Tall Ironweed
Vernonia altissima 'Jonesboro Giant'

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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

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive bobb1047 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.

Regional...

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

Mc Donald, Ohio



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