Spiraea billardii
Spiraea billardii · Rosaceae
📷 Michael Apel · CC BY-SA 3.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around spiraea billardii and prepare for winter.
ID card
- Family
- Rosaceae
- Foliage
- Deciduous
- Flowering
- June to August, pale pink to red flowers
- Adult size
- 1.5 to 1.8 m in height
- Growth
- Fast
- Hardiness
- Very hardy (down to -20 °C)
- Origin
- North America
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Billard's spiraea flowers on new wood (June-July-August): prune it hard at the end of winter (February-March), cutting it back to 30-40 cm from the ground.
The common mistake
Don't skip pruning or prune after summer flowering; it becomes woody and unproductive.
The pro's trick
Prune severely every late February (cut back to 1/3 of height): you'll get way more flowers and a compact shape.
Care
Sunlight
Billard spiraea prefers a sunny exposure for generous flowering and a compact shape. It tolerates light partial shade, but flowering may be less abundant. Avoid overly shaded areas or spots exposed to strong winds.
Watering
Keep the soil moist but well-drained, particularly during dry summer periods. Under normal conditions, natural water supply is generally sufficient once the plant is established. Water regularly during the first year to promote root development.
Soil
This spiraea adapts to most soils but prefers rich, well-drained potting mix. It tolerates slightly acidic to neutral soils. Enrich the soil at planting time with well-decomposed compost for best results.
Pruning and maintenance
Prune lightly after flowering (August-September) to maintain balanced shape and encourage branching. Remove dead or diseased branches in spring. A severe rejuvenating pruning every 3-4 years promotes vigor and density.
Fertilizing
A balanced fertilizer application in spring is generally sufficient. Supplement with a compost mulch at the base of the plant each autumn to gradually enrich the soil. Avoid excess nitrogen which promotes foliage at the expense of flowering.
Diseases and pests
Billard spiraea is generally hardy. It can occasionally be affected by powdery mildew in humid conditions. Ensure good air circulation and avoid persistent leaf wetness. No major pests regularly affect it.
Did you know?
Billard spiraea owes its common name to French botanist Jean-Baptiste-Auguste Billard. Its pink-red flower spikes, highly durable and attractive, make it a valued shrub for wildflower gardens and pollinator hedgerows, as it provides an important source of nectar and pollen in summer, precious for bees and butterflies.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.