Hydrangea aspera 'Koki'
hydrangea 'Koki'
An upright to spreading deciduous shrub to around 2m high, with ovate, lightly toothed leaves that are deep red when young, maturing to greenish purple with deep purple undersides. Produces large, slightly domed flower heads in late summer, with small, purple-pink flowers in the centre and larger pale pink sterile florets around the outside
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Size
Ultimate height
1.5–2.5 metresTime to ultimate height
2–5 yearsUltimate spread
1.5–2.5 metresGrowing conditions
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Red Purple Green | |||
|---|---|---|---|---|
| Summer | Pink Purple | Red Purple Green | ||
| Autumn | Purple Green | |||
| Winter |
Position
- Partial shade
Aspect
East–facing or West–facing
Exposure
Sheltered Hardiness
H5Botanical details
- Family
- Hydrangeaceae
- Native to GB / Ireland
- No
- Foliage
- Deciduous
- Habit
- Columnar upright, Spreading branched
- 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
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
Suggested planting locations and garden types
- City and courtyard gardens
- Cottage and informal garden
- Flower borders and beds
- Wall side borders
Pruning
See pruning group 4 (hydrangeas)
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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