Mountain Alyssum
Alyssum montanum · Brassicaceae
📷 Krzysztof Ziarnek, Kenraiz · CC BY-SA 4.0
The gardener's calendar
Ideal time to plant mountain alyssum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Brassicaceae
- Plant type
- Herbaceous perennial
- Foliage
- Evergreen, gray-green
- Flowering
- April to May, white or yellow flowers
- Mature size
- 25 cm tall, compact and spreading habit
- Exposure
- Full sun
- Hardiness
- Very hardy, down to -15°C
- Origin
- Mountainous regions of Europe
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Alyssum saxatile loves well-drained, slightly gravelly soil, with full sun exposure facing south or southeast. Water-efficient, very hardy.
The common mistake
Planting it in rich, moist soil or in shade: it rots or becomes weak and sparse-flowering.
The pro's trick
After spring flowering (May), cut back half its height: it'll bounce back and flower again in June-July, something most gardeners don't know.
Care
Exposure
Mountain alyssum demands full sun to flower well and maintain a compact habit. Place it in an open location, away from shading by trees or buildings. Prolonged sun exposure enhances your foliage color and stimulates generous flowering.
Soil
This plant prefers well-drained soil, even poor or chalky soil. Soil too rich in organic matter encourages vegetation at the expense of flowering. Improve drainage with gravel or sand if your soil retains water.
Watering
Mountain alyssum tolerates drought well once established. Water moderately during growth, then reduce during dormancy. Avoid excess moisture that risks rotting the roots. In well-drained soil, spaced waterings are sufficient.
Pruning and shaping
Prune lightly after flowering to maintain a dense, bushy habit. Remove spent flowers to encourage longer blooming. A one-third height pruning every two years rejuvenates the plant and prevents legginess.
Fertilizer
Mountain alyssum has moderate nutritional needs. A light application of balanced fertilizer in spring is ample. In poor soil, minimal feeding actually promotes better flowering than excess nitrogen.
Diseases and pests
This plant is generally very hardy and little affected by common diseases. Ensure good drainage to prevent root rot in case of excessive moisture. In dry conditions, it is rarely affected by pests.
Did you know?
Mountain alyssum is a classic in alpine gardens and rockeries since the 19th century. Its name Alyssum means "against rage" in ancient Greek, as it was once credited with soothing properties. Today, it remains a pioneering plant highly valued for adorning dry stone walls and rocky spaces, where it flowers generously with minimal care.
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.