Erysimum Species, Big Wallflower, Prairie Rocket, Plains Wallflower, Western Wallflower

Erysimum asperum

Family: Brassicaceae (brass-ih-KAY-see-ee) (Info)
Genus: Erysimum (er-RIS-ih-mum) (Info)
Species: asperum (ASS-per-um) (Info)
Synonym:Cheiranthus asper
Synonym:Cheirinia aspera



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


6-12 in. (15-30 cm)


9-12 in. (22-30 cm)


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)

Where to Grow:

Unknown - Tell us


Unknown - Tell us

Bloom Color:


Bright Yellow

Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:


Propagation Methods:

From herbaceous stem cuttings

From seed; sow indoors before last frost

From seed; direct sow after last frost

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Properly cleaned, seed can be successfully stored


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

Santa Barbara, California

Boise, Idaho

Hannibal, New York

Chapel Hill, North Carolina

Belfield, North Dakota

Leesburg, Virginia

Walla Walla, Washington

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Gardeners' Notes:


On May 16, 2010, dreamlayers from Windsor, ON (Zone 6b) wrote:

I got these in a wildflower seed packet. They're one of the few species that come up again year after year. The orange colour is intense and beautiful, the flowers smell good and flowering lasts for several months.

Last year the location became very shady, but the wallflowers still kept growing and blooming. I collected some seeds and sowed them in a few other locations. This resulted in many new plants. They even grew in clay soil which is often dry.


On Jan 31, 2007, bluespiral from (Zone 7a) wrote:

from The Fragrant Path by Louise Beebe Wilder:

"Delightful plant with glowing orange-colored flowers forming a showy cluster. They are very fragrant. Hillsides and sandy wastes in California."

And from Hortus Third, revised by staff of the L. H. Bailey Hortorium, Cornell U:

The origin of the Siberian wallflower is, in fact, "from western and central North America. [It is also called 'Western Prairie Rocket' as it does shoot up to 3']."

If you are gardening in the cottage garden style, where all times of year are celebrated by some aspect of seasonal planting, there is a small grouping unique to late winter that would provide flowers and fragrance during warm spells. The woody component of this association would contr... read more


On Feb 1, 2003, Baa wrote:

An evergreen biennial or short lived perennial from North America.

Has greyish to mid green, lance like leaves. Bears 4 petalled, dark orange to yellow flowers on long, upright stems.

Flowers March - June

Loves a well drained, neutral to alkaline soil in sun or light shade.