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ShrubsSynonym

Hydrangea macrophylla Curly Sparkle Red

hydrangea [Curly Sparkle]

A deciduous shrub to 1.5m high with broadly oval, toothed dark green leaves. Dome-shaped clusters of flowers are produced in summer, initially light green and developing into shades from near red to purple and blue, and with rippled edges to the petals giving a frilly appearance. Flower colour will vary depending on the growing medium

Synonyms

Hydrangea macrophylla 'H213901'^PBR
Hydrangea macrophylla 'Curly Sparkle Blue'
see moreHydrangea macrophylla Curly Sparkle Red
Hydrangea macrophylla Curly Sparkle Hot Pink

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Ultimate height

1–1.5 metres

Time to ultimate height

2–5 years

Ultimate spread

1–1.5 metres

Clay

Loam

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

East–facing or North–facing or West–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Hydrangeaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy
Potentially harmful: Skin allergen. Wear gloves and other protective equipment when handling. Pets (dogs, cats): Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Hydrangea can be deciduous or evergreen shrubs, or self-clinging climbers, with flowers in clusters usually comprising both small fertile and more showy sterile flowers; often good autumn colour
Name status: Trade
Horticultural Group: Hortensia hydrangeas (also known as mopheads) are compact bushy deciduous shrubs with broadly ovate leaves and rounded flower clusters composed almost entirely of showy sterile flowers

How to grow

Cultivation

Grow in any moist but well-drained soil in partial shade or grow in sun if soil remains reliably moist. Improve chalky soils with organic matter to support good growth. See shrubby hydrangea cultivation for further advice

Propagation

Propagate by softwood cuttings in early summer, or by hardwood cuttings in winter. As this plant is protected by Plant Breeders' Rights, any propagation should be for personal rather than commercial use

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Coastal
Flower borders and beds

Pruning

See pruning group 4 for further advice and video guide

Pests

May be susceptible to aphids, capsid bug, red spider mite, stem and bulb eelworm, vine weevil and scale insects

Diseases

May be susceptible to a leaf spot, powdery mildews, grey moulds (Botrytis) and honey fungus (rarely)

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