Roundleaf Thoroughwort

Eupatoriumrotundifolium

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Eupatorium (yoo-puh-TOR-ee-um)
Species
rotundifolium (ro-tun-dih-FOH-lee-um)
Synonym
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Deciduous
Herbaceous
Height
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
Spacing
24-36 in. (60-90 cm)
36-48 in. (90-120 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)
Danger
N/A
Bloom Color
White/Near White
Bloom Time
Mid Summer
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
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; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

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

Midway, Georgia

Richmond Hill, Georgia

Marietta, Mississippi

Brooklyn, New York

Middle Village, New York

Wallkill, New York

Guysville, Ohio

Coatesville, Pennsylvania

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Gardener's Notes:

1
positive
1
neutral
0
negative
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F
NYC, NY (Zone 7a) | October 2018 | neutral

For more useful info. on this native wildflower, check here:

[...Read More

R
Downingtown, PA | August 2015 | positive

I just discovered this species growing wild in an open glade in Sadsbury Woods in southeast Pennsylvania. Some Highbush Blueberry shrubs ...Read More

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