Sea campion
Silene uniflora · Caryophyllaceae
The gardener's calendar
Ideal time to plant sea campion: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Caryophyllaceae
- Type
- Perennial herb
- Foliage
- Evergreen
- Flowering
- May to July
- Adult size
- 15 to 30 cm in height
- Hardiness
- Very hardy (-15 °C)
- Growth
- Slow to moderate
- Origin
- Rocky coasts of Northern and Western Europe
Care
Exposure
Bladder campion prefers full sun to partial shade. It thrives best in full sunlight, which intensifies its white flowering. Avoid overly shaded areas where the plant may become leggy.
Soil
This plant appreciates well-draining, light soil that is slightly acidic to neutral. It adapts well to poor and rocky terrain, typical of its coastal habitats of origin. Amend the soil with sand or gravel to improve drainage in heavy soil.
Watering
Water moderately during the growing season, allowing the soil to dry slightly between waterings. Once established, this plant tolerates drought well thanks to its adapted root system. Reduce watering in winter.
Pruning and maintenance
Remove spent flowers to extend blooming. In late winter or early spring, clean away dead or dried parts. Light pruning after flowering helps maintain a compact, bushy shape.
Fertilizing
Bladder campion has low nutritional needs. A light application of balanced fertilizer in spring is quite sufficient. Prioritize good drainage and adequate soil rather than intensive fertilizing, which could encourage excessive growth at the expense of flowering.
Diseases and pests
This plant is generally very robust and rarely affected by diseases. Watch for excess moisture which could cause root rot. Good drainage prevents most problems; if the plant weakens, improve growing conditions rather than resorting to chemical intervention.
Did you know?
The name 'uniflora' means 'one-flowered' but this plant actually produces several flowers, its delicate white blooms flowering in small clusters. Its other nickname, bladder campion, comes from its inflated sepals which form a characteristic fleshy little pouch. Long ago, the young leaves of this coastal plant were eaten in Ireland and Brittany, where it grows abundantly on maritime cliffs and rocks.
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.
Add this plant to my garden →Plants from the same family
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Tips generated and checked by Viridia — adapt them to your local climate.