Rose of Sharon
Hibiscus syriacus · Malvaceae
📷 Wilhelm Zimmerling PAR · CC BY-SA 4.0
The gardener's calendar
Rose of sharon is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Scientific name
- Hibiscus syriacus
- Family
- Malvaceae
- Type
- Deciduous shrub
- Mature height
- 1.5 to 2 m
- Flowering
- July to September
- Exposure
- Full sun
- Hardiness
- Down to -15°C
- Origin
- Asia (India, China)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Hibiscus syriacus flowers late (July-September) because it loves heat: plant it facing south and wait for the soil to really warm up before watering generously.
The common mistake
Pruning it too early in spring or too short: this delays or reduces flowering.
The pro's trick
Each flower lasts just one day, but the succession keeps going strong.
Care
Exposure
Hibiscus syriacus demands full sun for generous and colorful flowering. Place it in a location receiving at least 6 to 8 hours of direct sunlight daily. A bright exposure guarantees abundant flowers and a compact shape.
Watering
Water regularly during the growing season and especially during flowering, particularly in dry periods. In summer, check that the soil doesn't dry out completely, but avoid waterlogging. In winter, reduce watering significantly.
Soil
Hibiscus appreciates well-drained soil, slightly acidic to neutral. Rich potting soil enriched with compost facilitates establishment. If your soil is heavy or compacted, loosen it and add sand or organic matter to improve drainage.
Pruning and maintenance
Prune in late winter (February-March), before growth resumes, to remove dead branches and structure the shrub. Light pruning encourages branching and flowering. Also remove faded flowers to extend the blooming period.
Fertilizer
Apply balanced fertilizer or flowering shrub-specific fertilizer in spring and early summer, every 4 to 6 weeks. Favor moderate application: excess nitrogen promotes foliage at the expense of flowers.
Pests and diseases
Watch for aphids and spider mites, particularly in dry conditions. Powdery mildew can appear in humid weather: ensure good air circulation. Watering at the base avoids foliage moisture and limits fungal problems.
Did you know?
Hibiscus syriacus, despite its epithet 'syriacus,' is not native to Syria but to India and China: it owes this name to a historical confusion by 17th-century botanists. In East Asia, it symbolizes ephemeral beauty since each flower lasts only one day, while in the West it has become emblematic of Mediterranean gardens and temperate regions.
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
- Small-leaved limeTilia cordata
- Marsh mallowAlthaea officinalis
- Silver LimeTilia tomentosa
- Crimean lindenTilia euchlora
- Swamp hibiscusHibiscus moscheutos
- Flower of an hourHibiscus trionum
Tips generated and checked by Viridia — adapt them to your local climate.