Chinese-plumbago
Ceratostigma willmottianum · Plumbaginaceae
📷 Wouter Hagens · CC BY-SA 3.0
The gardener's calendar
Chinese-plumbago is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Scientific name
- Ceratostigma willmottianum
- Family
- Plumbaginaceae
- Type
- Deciduous shrub
- Adult height
- Approximately 1 m
- Flowering
- August to October
- Flower color
- Intense cobalt blue
- Hardiness
- Down to approximately -10 °C
- Origin
- China (Sichuan province)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Ceratostigma blooms late (August-October): that's its strength. It needs very well-drained soil and full sun with no shade.
The common mistake
Failing to prune or pruning too late: the plant becomes leggy, invasive, and flowering is reduced to a few apical flowers.
The pro's trick
First year, light pruning in June forces branching; subsequent years, pruning in April is enough and more than sufficient.
Seasonal watch
In autumn, early frosts can shorten blooming; plant it in a sheltered south-facing position.
Care
Exposure
Position your ceratostigma in full sun for generous and colorful blooming. A minimum of 6 hours of direct daily light. In partial shade, flowering will be less spectacular and the plant will become leggy.
Watering
This shrub tolerates drought well once established. Water regularly during the first year to promote rooting, then gradually space out watering. During active growing season (spring-summer), keep soil slightly moist without excess. Drastically reduce watering in winter.
Soil
Choose well-draining soil, even poor or stony. Ceratostigma fears waterlogging and heavy clay soils. Adding sand or pumice improves drainage. Neutral to slightly alkaline pH is ideal.
Pruning and maintenance
Prune lightly after flowering (November) or in early spring to maintain a compact, branched shape. Remove dead or frost-damaged branches. A vigorous rejuvenation pruning is possible every 3-4 years to reinvigorate the plant.
Fertilizer
Moderate application of balanced fertilizer in spring is sufficient. Avoid excess nitrogen which would reduce flowering. A low-nitrogen formula (such as fertilizer for flowering perennials) suits it better. In naturally fertile soil, fertilizer may be unnecessary.
Health and pests
Very hardy and seldom troubled by disease in appropriate conditions. Excessive moisture promotes root rot. Watch for spider mites in very dry climates. No major pests reported. Good air circulation prevents fungal problems.
Did you know?
Ceratostigma owes its scientific name to the British botanist Ellen Willmott (1858-1934), a passionate gardener and collector of rare plants. Its flowers with their electric blue hue in full autumn contrast beautifully with the deciduous foliage that reddens before falling, offering a remarkable chromatic palette at the end of the season.
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.
Add this plant to my garden →Plants from the same family
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- Ceratostigma griffithiiCeratostigma griffithii
- Armeria arenariaArmeria arenaria
- Limoniastrum monopetalumLimoniastrum monopetalum
Tips generated and checked by Viridia — adapt them to your local climate.