Red valerian
Centranthus ruber · Caprifoliaceae
📷 Wikimedia Commons · CC BY-SA 3.0
The gardener's calendar
Red valerian is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Common name
- Red Valerian
- Family
- Caprifoliaceae
- Type
- Perennial herbaceous plant
- Adult height
- 60 to 80 cm
- Flowering
- May to September
- Flower color
- Bright red to pink
- Foliage
- Deciduous
- Hardiness
- Very hardy (-15 °C)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Red valerian adapts well to poor, dry soil once established. It flowers better without fertilizer.
The common mistake
Letting it grow freely in rich soil creates a soft, overly tall plant that flops and flowers less.
The pro's trick
Sow seeds directly where you want them: they germinate easily and produce sturdier, better-adapted plants than nursery stock.
Seasonal watch
In August-September, during hot spells, a deep watering every 10 days helps trigger more blooms.
Care
Exposure and light
Red valerian thrives in full sun, with a minimum of 6 to 8 hours per day. A south or west-facing exposure is ideal to guarantee generous flowering and vibrant colors. It tolerates partial shade but will flower less abundantly.
Watering
This very drought-resistant plant requires little water once established. Water moderately when planting, then let the soil dry out between waterings. During very hot summers, weekly watering is sufficient. Avoid excess moisture which promotes rot.
Soil and drainage
Red valerian adapts to almost any soil, even poor, chalky or rocky soil. Good drainage is essential: improve clay soils with sand or gravel. It particularly enjoys well-drained soil that is not very fertile.
Pruning and cleanup
Cut the plant back lightly after the first flowering to stimulate a fresh wave of blooms. In autumn, remove dried stems for a neater appearance. Severe pruning in late winter is not necessary: simple removal of dead wood is sufficient.
Fertilization
No fertilizer is essential: this plant prefers poor soils and too much fertility risks promoting foliage at the expense of flowers. A light application of compost in spring is optional and more than enough.
Health and pests
Red valerian is very robust and rarely subject to diseases. Powdery mildew may appear in humid conditions: ensure good drainage and air circulation. Aphids are occasional but rarely problematic. Chemical treatment is generally not necessary.
Did you know?
Red valerian is native to the Mediterranean basin and has naturalized in temperate Europe, notably on old walls and castle ruins where it has colonized cracks in the stone. Its ability to thrive in the harshest and most barren environments makes it a true survivor plant, appreciated in rockeries and modern xerophytic gardens.
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.