Veronicastrum Species, Culver's Root, Blackroot, Great Virginian Speedwell, Siberian Culver's Root

Veronicastrumsibiricum

Genus
Veronicastrum (ver-on-ee-KAS-trum)
Species
sibiricum (sy-BEER-ah-kum)
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Herbaceous
Height
4-6 ft. (1.2-1.8 m)
Spacing
12-15 in. (30-38 cm)
15-18 in. (38-45 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)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
N/A
Bloom Color
Lavender
Bloom Time
Mid Summer
Late Summer/Early 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
Grow outdoors year-round in hardiness zone
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Non-patented
Propagation Methods
Seed Collecting
Regional

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

Chicago, Illinois

Rockford, Illinois

Waukegan, Illinois

Dearborn Heights, Michigan

Minneapolis, Minnesota

Owatonna, Minnesota

New Milford, New Jersey

Boone, North Carolina

Olympia, Washington

Ellsworth, Wisconsin

Menasha, Wisconsin

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Gardener's Notes:

2
positives
0
neutral
1
negative
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J
Ellsworth, WI (Zone 4a) | June 2012 | negative

Interesting foliage but flowers are not nearly as attractive as I'd hoped for. Plant stems have been breaking quite a bit which creates ...Read More

M
Coon Rapids, MN (Zone 4a) | July 2008 | positive

Compare to the North America native culver's root, this species have larger leaves and larger flower spikes that have a soft bluish purpl...Read More

S
Menasha, WI (Zone 4b) | June 2005 | positive

This has been a perfect plant for me. It grows well over 6' and does not multiply. It requires no special care and has not been bothere...Read More

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