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HYDRANGEA seemannii
Commonly known as Hortensia
Excellent evergreen climber for shade or north wall, flowers white
Further Reading....
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EvergreenLeathery, mid-green leaves to 15cm (6in) long.
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WhiteGreenish-white flowers
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Height10m (33ft)
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Spread5m (26ft)
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ClimberSome of these climbing plants will need trellis or wire supports if grown on walls or fences. Other grow aerial roots and are self-clingingWoody climber clinging by aerial roots. Flowers in domed corymbs to 15cm (6in) across.
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Hardy - average winterHardy through most of the UK apart from inland valleys, at altitude and central/northerly locations. May suffer foliage damage and stem dieback in harsh winters in cold gardens. Plant can withstand temperatures down to -10°C (14°F)
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Full sunShelter from cold winds
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Partial shade
HYDRANGEA seemannii
- Details
- Description
- Tips and Advice
- Goes Well With
- Planting Combinations
- Other Suggestions
- See Also...
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Additional FeaturesPests & DiseasesRed spider mites, scale insects, vine weevils, capsid bugs, grey mould(Botrytis), hydrangea virus, powdery mildew, leaf spot, honey fungus.Place of originMexico
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Burncoose SpecialitiesHydrangeas
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HardinessFrost hardy (down to -5)
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Leaf marginSerrulate
(see photos above) -
Leaf shapeElliptic
(see photos above) Lanceolate(see photos above) -
Pruning groupPruning group 6Suitable for: Evergreen shrubs or climbers that need little to no pruning.
Action: Trim back shoots that spoil symmetry and to fit available space.
When: Annually after flowering if on previous year's growth, or in later Winter or Spring if flowering on current year's growth, or as requires.
RHS group 9 & 11 -
Seasonal InterestSummer
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Soil ConditionsFertile moist well-drained soilHumus-rich
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Toxic - Category CMay cause skin allergy(People & Pets) Maybe harmful to pets if eaten
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WildlifeRabbit Resistant
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Hydrangeas - Care Guide
- Hydrangeas for everyone!
- Quick tour of hydrangea stocked - Video Tip ondemand_video
- Soil & Feeding
- Pruning Hydrangeas
- Pruning Hydrangeas - Video Tip ondemand_video
- Hydrangeas, keeping them blue - Video Tip ondemand_video
- Propagation
- Drying Flower Heads
- Drying hydrangea flower heads - Video Tip ondemand_video
- Popular Mopheads & Lacecaps
- Hydrangeas and other plants
- Further Reading
Hydrangeas - Video Spotlights
Useful extras...

Fertilisers & Feeds - Vitax
Q4 Pelleted Fertiliser
A useful fertiliser suitable for use on a wide variety of plants. Q4 provides all the nutrients and trace elements essential for vigorous growth, abundant flowering and ripening of fruit.
3 options from £6.00

Fertilisers & Feeds - Empathy
Rootgrow mycorrhizal fungi
Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
2 options from £6.00

Fertilisers & Feeds - Empathy
All-purpose Seaweed Stimulant
All-purpose organic concentrated seaweed feed that is a ready to use, derived from sustainable harvested kelp, that can be used on all outdoor and indoor plants, except acid loving plants.
Perfect used in conjunction with Rootgrow™.
Only £7.50

Fertilisers & Feeds - Vitax
Hydrangea Colourant
For changing pink hydrangea flowers to blue, or making blue flowers darker. If your soil is alkaline the proportions should be doubled.
Only £6.50

Garden Goodies
Slate Plant Labels
These wonderfully tactile natural slate plant labels are hand made in Cornwall and come with a chalk pen.
Just stick them in your pot or border. Pack of 6.
Only £10.20

Garden Goodies
Slate Tie-on Plant Labels
Hand made in Cornwall, these delightful natural slate labels are perfect for pots.
Comes with chalk pen. Pack of 5
Only £10.20