Erysimum Species, European Wallflower, Siberian Wallflower, Tall Wormseed Mustard

Erysimumhieraciifolium

Family
Brassicaceae (brass-ih-KAY-see-ee)
Genus
Erysimum (er-RIS-ih-mum)
Species
hieraciifolium (hi-er-ay-see-ih-FOH-lee-um)
Synonym
Erysimum afghanicum
Erysimum robustum
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Evergreen
Herbaceous
Smooth
Height
6-12 in. (15-30 cm)
12-18 in. (30-45 cm)
Spacing
9-12 in. (22-30 cm)
Hardiness
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)
Bloom Color
Orange
Bright Yellow
Bloom Time
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Other Details
Category
Groundcovers
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Dark/Black
Where to Grow
Can be grown as an annual
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
Direct sow as soon as the ground can be worked
Seed Collecting
Collect seedhead/pod when flowers fade; allow to dry
Allow seedheads to dry on plants; remove and collect seeds
Regional

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

Soda Springs, Idaho

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Gardener's Notes:

0
positive
1
neutral
0
negative
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Oklahoma City, OK (Zone 7a) | September 2004 | neutral

It has been introduced to the U.S. and I believe is naturalized in Illinois, Indiana, Michigan, New York, Pennsylvania and Wisconsin.

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