Star-mustard
Coincya monensis · Brassicaceae
The gardener's calendar
Ideal time to plant star-mustard: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Brassicaceae
- Type
- Herbaceous
- Foliage
- Deciduous
- Flowering
- Spring to summer (April-July)
- Adult size
- 30-60 cm in height
- Hardiness
- Hardy, tolerates cold temperatures
- Origin
- Channel Islands (Isle of Man)
- Growth
- Fast
Care
Exposure
Install Coincya monensis in full sun for optimal flowering. It tolerates partial shade but develops better with at least 6 hours of direct light per day. This plant appreciates well-ventilated locations, particularly in coastal climates.
Soil and drainage
Choose well-drained soil, preferably slightly acidic to neutral. Coincya monensis tolerates poor and rocky soils, making it ideal for difficult gardens. Avoid waterlogging, especially in winter.
Watering
Water moderately during active growth in spring and summer. Reduce watering in winter when the plant slows its development. Let the soil dry out slightly between waterings to prevent root rot.
Fertilizer
A balanced fertilizer application in spring is generally sufficient. This plant is not very demanding and prefers naturally fertile soil. Avoid excess nitrogen which would promote foliage at the expense of flowering.
Pruning and maintenance
Pinch back the tips at the young stage to encourage branching and a compact shape. Remove spent flowers to prolong flowering. At the end of the season, cut back the plant or let it reseed naturally.
Diseases and pests
Like other Brassicaceae, it can be subject to flea beetles and cabbage flies. Check foliage regularly and apply preventive measures if needed. Generally, it remains robust and trouble-free in good conditions.
Soil and drainage
Choose well-drained soil, preferably slightly acidic to neutral. Coincya monensis tolerates poor and rocky soils, making it ideal for difficult gardens. Avoid waterlogging, especially in winter.
Did you know?
Coincya monensis is a rare plant endemic to the Isle of Man, where it grows on wind-exposed coastal cliffs. This crucifer flowers bright yellow and represents a remarkable example of adaptation to harsh marine conditions. It has long interested botanists for its unique genetics within the Coincya genus.
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.