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Hydrangea macrophylla 'Altona' (H)
  • RHS AGM

hydrangea 'Altona'

'Altona' is a small deciduous shrub with broadly ovate leaves. Hortensia-type with large rose-red sterile florets, turning to green then deep red in autumn. Blues well on acid soils

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
5–10 years
Ultimate spread
1–1.5 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained, Well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Red Green
Autumn Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

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

Exposure
Exposed or Sheltered
Hardiness
H5
Botanical details
Family
Hydrangeaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
May cause mild stomach upset if ingested, contact with foliage may aggravate skin allergies. Wear gloves and other protective equipment when handling
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
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 moist but well-drained soil in sun or partial shade

Propagation

Propagate by softwood cuttings

Suggested planting locations and garden types
  • City and courtyard gardens
  • Patio and container plants
  • Cottage and informal garden
  • Low Maintenance
  • Flower borders and beds
Pruning

Pruning group 1

Pests

Can get aphids, capsid bug, glasshouse red spider mite and hydrangea scale

Diseases

Generally disease free

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