About
Hydrangea arborescens, the North American wild hydrangea, is a deciduous shrub with dark-green foliage, sturdy stems and large, snowball-shaped, white flowerheads in midsummer. Extremely cold-hardy and adaptable, it is one of the most reliable hydrangeas for exposed or cold positions.
About the genus
Hydrangea are deciduous or evergreen shrubs, or self-clinging climbers, with flowers in clusters usually comprising both small fertile and larger, showier sterile florets. They are grown for their dramatic and long-lasting flowerheads and often good autumn colour.
Growing conditions
SunlightPartial shade
Soil typeClay, Loam
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectNorth-facing, West-facing, East-facing
ExposureSheltered
UK hardinessH5
Plant details
Plant typeShrubs
HabitBushy
FoliageDeciduous
Height0.5-1 metres
Spread0.5-1 metres
Time to full height5-10 years
Suggested usesCity and courtyard gardens, Cottage and informal garden, Patio and container plants
Native toJapan
ToxicitySkin 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
Care notes
CultivationGrow 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
PruningPruning group 4
PropagationPropagate by softwood cuttings in early summer, or by hardwood cuttings in winter
Pest resistanceMay be susceptible to aphids, capsid bug, red spider mite, stem and bulb eelworm, vine weevil and scale insects
Disease resistanceMay be susceptible to a leaf spot, powdery mildews, grey moulds (Botrytis) and honey fungus (rarely)