Wall rock cress
Arabis caucasica · Brassicaceae
📷 Ulf Eliasson · CC BY-SA 3.0
The gardener's calendar
Ideal time to plant wall rock cress: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, grey-green
- Flowering
- March to May, white or pale pink flowers
- Mature size
- 25–30 cm tall, 30–40 cm spread
- Growth
- Fast
- Hardiness
- Very hardy, down to -15°C
- Origin
- Caucasus region
- Soil type
- Well-drained, tolerates limestone
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Caucasian arabis is a short-lived perennial (3-4 years) that self-seeds heavily: divide old plants each spring or collect the siliques before ripeness to prevent it from taking over.
The common mistake
Treating it as a stable perennial: it gets exhausted and opens up in the center.
The pro's trick
Sow in autumn (September-October) in place for even earlier flowering (February-March) and robust rosettes.
Care
Sunlight
Caucasian Rockcress demands a sunny exposure to flower abundantly and maintain compact growth. It tolerates light partial shade, but flowering will be less generous. Avoid dense shade areas that cause the plant to become leggy.
Watering
Water regularly during the first summer after planting to establish the plant well. Once established, it resists moderate drought and prefers soil that is dry to slightly moist. Avoid excess humidity in winter, which causes rot.
Soil
Install it in well-drained soil, poor to moderately fertile. Adding gravel or sand improves drainage if your soil is heavy. This plant tolerates limestone and rocky soils well.
Pruning and maintenance
Prune lightly after flowering to maintain compact shape and encourage a second flush of blooms in autumn. Remove dead or damaged stems in spring. Regular tidying removes senescent leaves.
Fertiliser
A moderate application of balanced fertiliser in spring is quite sufficient. Avoid excessive feeding, which promotes foliage at the expense of flowering.
Diseases and pests
Generally very healthy, it can be affected by aphids or flea beetles in hot, dry weather. Ensure good air circulation to prevent powdery mildew in humid environments. A gentle treatment (soapy water) is usually sufficient.
Did you know?
Caucasian Rockcress is a pioneer plant of rocky areas and stone walls, long used by keepers of Central European castles as a hardy and colourful ground cover. Its Latin name *Arabis* derives from the Arabic word 'raba' (Caucasus region), testifying to its botanical journey from the East.
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.