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PlantSnap
Plant Care
Spreading wallflower
(Erysimum diffusum)
Also Known As
Spreading wallflower, Western wallflower, Diffuse wallflower, California wallflower
About This Plant
Erysimum diffusum is a species of flowering plant in the family Brassicaceae, native to western North America. It is a perennial herb growing from a woody base and producing a slender, erect stem up to about 50 cm tall. The leaves are linear to lance-shaped and up to 10 cm long. The inflorescence is a raceme of bright yellow flowers with four petals each up to 2 cm long.
Plant Care Instructions
Outdoor Size Range
18-36 inches (45-90 cm)
Light Requirements
Erysimum diffusum requires full sun to partial shade. It is best to place it in a location that receives at least 6 hours of direct sunlight per day.
Humidity Needs
Erysimum diffusum does not have any specific humidity requirements.
Fertilizing Schedule
Erysimum diffusum does not require heavy fertilization. Apply a balanced fertilizer once per month during the growing season.
Pruning Guidelines
Erysimum diffusum requires regular pruning to maintain its shape and promote bushy growth. Prune back the stems by one-third after flowering.
Common Pests and Diseases
Erysimum diffusum is generally pest-free, but it may be susceptible to aphids and whiteflies.
Indoor Size Range
10-24 inches (25-60 cm)
Watering Schedule
Erysimum diffusum prefers well-draining soil and moderate watering. Water it when the top inch of soil feels dry to the touch.
Temperature Range
Erysimum diffusum prefers cool to moderate temperatures, with a range of 50-75°F (10-24°C).
Growing Season
Erysimum diffusum blooms from late spring to early summer.
Growing Difficulty Level
Erysimum diffusum is moderately easy to grow.
USDA Hardiness Zones
Erysimum diffusum is hardy in USDA zones 5-9.
Did You Know?
The Diffuse Wallflower is the state flower of Montana, USA.
