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Western wallflower

Erysimum capitatum · Brassicaceae

The gardener's calendar

The right move for September

Ideal time to plant western wallflower: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Evergreen to semi-evergreen
Flowering
Spring to early summer (April-June)
Adult size
30 to 60 cm tall, 20 to 40 cm wide
Growth
Fast
Hardiness
Hardy to -10°C
Origin
Western North America
Soil type
Well-drained, poor to moderate
Habit
Herbaceous, bushy

Care

Light Exposure

Place your western wallflower in a very sunny location, receiving at least 6 hours of direct sunlight daily. This plant dislikes shade and will quickly become leggy in insufficient light. South or west-facing exposure is ideal for stimulating abundant flowering.

Soil and Drainage

Western wallflower prefers well-drained soil that is rather poor or of moderate fertility. Avoid heavy, clay-based, or constantly moist soil that promotes root rot. Adding sand or gravel helps facilitate natural drainage.

Watering

Water moderately once established, especially during active growing periods. Allow the soil to dry out slightly between waterings. In winter or during humid weather, reduce watering to prevent excess moisture, which is the main cause of damage.

Fertilizing

This undemanding plant requires minimal fertilizer. A light application in spring is usually sufficient. Overly rich soil produces vigorous foliage at the expense of flowering.

Pruning and Pinching

Pinch back the shoot tips early in the season to promote a more compact, bushy habit. Regularly deadhead spent flowers to extend the flowering period. In late winter, remove any dead or damaged stems.

Diseases and Pests

Watch for crown rot, which is favored by standing moisture. Aphids and whiteflies may infest young foliage. Ensure good air circulation around the plant and avoid overwatering to prevent fungal problems.

Did you know?

Western wallflower is one of the most colorful wild plants of the coastal ranges of California and Nevada. Its botanical name 'capitatum' means 'in a head,' referring to the characteristic compact flower clusters. This hardy plant has a long history of ornamental use in rock gardens and Mediterranean-style landscapes in dry regions.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.