Plants by mail order since 1984, over 4100 plants online today!
6th January 2021. In line with the current government lockdown rules, Burncoose Nurseries is closed to visitors. However at present we are able to offer click and collect to local customers. This will be weekdays only, not weekends.
Mail order is continuing as normal. However please allow extra time for the couriers to deliver, once despatched from us. Sorry to say that some depots are experiencing high volumes of traffic, also staff shortages.

HYDRANGEA serrata 'Grayswood'
Commonly known as Hortensia
Blue centre and outer florets deep crimson
Further Reading....
- Details
- Description
- Mature Size
- Tips and Advice
- Goes Well With
- Planting Combinations
- Other Suggestions
- See Also...
We recommend the use of Hydrangea blueing agent for all blue varieties. Due to the difficulties of growing blue Hydrangeas in pots, the first flush of flowers may flower pink. Please see below our article on Hydrangea care for full information.
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Deciduous - narrowly oval, pointed, mid-green leaves to 15cm (6in) long.
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Blue - blue centre, outer florets deep crimson as they age.
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Height - 2m (6½ft)
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Spread - 2m (6½ft)
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Medium shrub - Typically grow to around 4-6 feet in height - vigorous, compact shrub. Flattened flowerheads 5-10cm (2-4in) across.
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Hardy - cold winter - Hardy in most places throughout the UK even in severe winters. May not withstand open/exposed sites or central/northern locations. Plant can withstand temperatures down to -15°C (5°F)
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Full sun - shelter from cold winds
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Partial shade
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Harmful if eaten - These will give you an upset tummy, so please don't eat any of these.
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May cause skin allergy or irritant - Having skin or eye contact with these plants could result in an allergic reaction, burning or rash.
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Additional Features - Pests & Diseases - - red spider mites, scale insects, vine weevils, capsid bugs, grey mould(Botrytis), Hydrangea virus, powdery mildew, leaf spot, honey fungus.
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Place of origin - Korea, Japan
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Burncoose Specialities - Hydrangeas -
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Flower Shape - Lacecap -
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Hardiness - Fully hardy -
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Pruning group - Pruning group 3
Suitable for: Deciduous shrubs that flower in the Summer or Autumn on previous year's growth, or deciduous shrubs that flower in late Winter-Spring on previous year's growth.
Pruning: Trim off old flowers to the first bud beneath flower head. Cut back 1/3 of the oldest stems to promote replacement growth.
When: Annually
RHS group 4 -
Seasonal Interest - Autumn -
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Summer
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Soil Conditions - Fertile moist well-drained soil - - humus-rich
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Wildlife - Rabbit Resistant -
Jan
Feb
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Hydrangeas - Care Guide
- Hydrangeas for everyone!
- 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
2m (6½ft)
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2m (6½ft) |
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