Hydrangea seemannii

RHS Plant Profile
Seemann's hydrangea

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Seemann's hydrangea Wolfgang Bopp
Seemann's hydrangea Wolfgang Bopp
Seemann's hydrangea Wolfgang Bopp
Climber Wall Shrub
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A woody, evergreen climber with aerial roots and leathery leaves up to 15cm long. Domed flower-heads, composed of greenish-white, fertile flowers surrounded by white bracts, appear in summer

Position

Full shade, Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

2.5-4 metres

Size

Time to Maturity
10–20 years
Max Spread
2.5-4 metres
Max Height
8-12 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full shade Full sun Partial shade
Aspect
South–facing or North–facing or West–facing or East–facing
Exposure
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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Hydrangeaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Climbing
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
Correct
Plant Range
Mexico

How to Grow

Cultivation

Grow in sun or shade, in a moist but well-drained soil enriched with well-rotted organic matter. Will only tolerate a few degrees of frost

Propagation

Propagate by layering

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Low Maintenance
  • Wall side borders

Pruning

Pruning group 11 after flowering

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)