Hydrangea aspera, commonly known as Rough-leaved Hydrangea, is a deciduous shrub or small tree native to the Himalayas and China. It is known for its large, velvety leaves and lacecap flowers that bloom in late summer. The plant prefers temperate climates and goes dormant in winter.
Hydrangea aspera requires indirect bright light and moderate temperatures. It thrives in high humidity and should be watered regularly to keep the soil evenly moist. The plant benefits from a cool, dormant period in winter.
Soil
Hydrangea aspera prefers well-draining loamy soil that is rich in organic matter. The soil should be kept evenly moist but not waterlogged. A slightly acidic to neutral pH is ideal for this plant.
Fertilizer
Use a balanced fertilizer with an N-P-K ratio of 10-10-10. Fertilize the plant in the spring and summer months to support its growth and flowering. Avoid over-fertilizing as it can harm the plant.
Repotting
Repot Hydrangea aspera every 2-3 years or when it outgrows its container. Choose a pot that is slightly larger than the current one and ensure it has good drainage. Repot in early spring before new growth begins.
Propagation
Propagate Hydrangea aspera through softwood cuttings taken in late spring or early summer. Dip the cuttings in rooting hormone and plant them in a well-draining soil mix. Keep the cuttings in a humid environment until they root.
Pruning
Prune Hydrangea aspera in late winter or early spring before new growth starts. Remove dead or damaged wood and thin out crowded branches to improve air circulation. Light pruning can also be done after flowering to shape the plant.
Toxicity
Hydrangea aspera is toxic to pets and humans if ingested. All parts of the plant contain cyanogenic glycosides, which can cause vomiting, diarrhea, and other symptoms. Keep the plant out of reach of children and pets.
Additional
Hydrangea aspera can benefit from mulching to retain soil moisture and regulate temperature. Use organic mulch like bark or compost around the base of the plant. Regularly check for pests like aphids and spider mites, and treat them promptly.
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