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Hydrangea seemannii

Seemann's hydrangea

RHS Plant Shop from £27.99 Sold by 51 nurseries

  • Other common names Seemann's hydrangea

  • Family Hydrangeaceae

  • 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

  • Details H. seemanii is 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

  • Plant range Mexico

Characteristics

  • Foliage Evergreen

  • Habit Climbing

  • Toxicity May cause mild stomach upset if ingested, contact with foliage may aggravate skin allergies. Wear gloves and other protective equipment when handling

  • 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

Sunlight

  • Full Shade

  • Full Sun

  • Partial Shade

  • Aspect South-facing or North-facing or West-facing or East-facing

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Loam

    Loam

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilClay, Loam, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 8-12 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 10-20 years

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 Wall-side Borders Low Maintenance City & Courtyard Gardens Cottage & Informal Garden

How to care

Pruning Pruning group 11 after flowering

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

Diseases Generally disease free

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RHS Plants Shop

Hydrangea seemannii

Seemann's hydrangea

Buy from £27.99 at the RHS Plants Shop

Buy from £27.99 at the RHS Plants Shop

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