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Hydrangea serrata 'Diadem' (L)

hydrangea 'Diadem'

'Diadem' is a compact, spreading deciduous shrub with lace-cap flower-heads of pale pink or light blue flowers in early summer

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
5–10 years
Ultimate spread
0.5–1 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring
Summer Blue Pink
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or West–facing or East–facing or North–facing

Exposure
Exposed or Sheltered
Hardiness
H4
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

Accepted

Horticultural Group
Lace cap hydrangeas are compact deciduous shrubs with broadly ovate leaves and flat or gently domed clusters of small fertile flowers, with showy sterile flowers around the margin

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

Suggested planting locations and garden types
  • Coastal
  • Cottage and informal garden
  • City and courtyard gardens
  • Wall side borders
  • Flower borders and beds
Pruning

Pruning group 1

Pests

May be susceptible to aphids, capsid bug, hydrangea scale and vine weevil

Diseases

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

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