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Hydrangea serrata 'Grayswood' (Hydrangea 'Grayswood')

Beginner
skill rating
1 hour care
per year
1.5m
Max height
1.5m
Max spread
5-10 years
To maturity
Low
Toxicity

Plant details

Botanical name

Hydrangea serrata 'Grayswood'

Other names

Hydrangea 'Grayswood', Sawtooth hydrangea 'Grayswood', Mountain hydrangea 'Grayswood', Hydrangea macrophylla var. serrata 'Grayswood'

Genus

Hydrangea Hydrangea

Variety or Cultivar

'Grayswood' _ 'Grayswood' is a vigorous, upright, deciduous shrub with prominently-veined, ovate, pointed, mid- to dark green leaves, flushed red in autumn, and, from summer into autumn, broad, flattened clusters of long-stalked, mauve fertile flowers and white sterile flowers turning dark red with age.


Hydrangea serrata 'Grayswood' is: Deciduous

Habit

Bushy, Upright

Toxicity

Can cause mild stomach upset if ingested and contact with foliage may aggravate skin allergies.

Awards

RHS AGM (Award of Garden Merit)

Flower

White, Mauve in Summer; Mauve, Red in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Flushed red, Dark-green in Autumn

How to care

Watch out for

Specific pests

Aphids , Capsid bug , Glasshouse red spider mite , Hydrangea scale Aphids , Capsid bug , Glasshouse red spider mite , Hydrangea scale

Diseases

Generally disease-free.

General care

Pruning

Pruning group 4 or 1.

Propagation methods

Softwood cuttings


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Where to grow

Hydrangea serrata 'Grayswood' (Hydrangea 'Grayswood') will reach a height of 1.5m and a spread of 1.5m after 5-10 years.

Suggested uses

City, Cottage/Informal, Flower Arranging, Beds and borders, Low Maintenance, Containers

Cultivation

Plant in moist, but well-drained, soil in sun or partial shade. Soil ph will determine flower colour.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4), Tender in frost (H3)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Hydrangea serrata 'Grayswood'

Other names

Hydrangea 'Grayswood', Sawtooth hydrangea 'Grayswood', Mountain hydrangea 'Grayswood', Hydrangea macrophylla var. serrata 'Grayswood'

Genus

Hydrangea Hydrangea

Variety or Cultivar

'Grayswood' _ 'Grayswood' is a vigorous, upright, deciduous shrub with prominently-veined, ovate, pointed, mid- to dark green leaves, flushed red in autumn, and, from summer into autumn, broad, flattened clusters of long-stalked, mauve fertile flowers and white sterile flowers turning dark red with age.

Foliage

Deciduous

Habit

Bushy, Upright

Toxicity

Can cause mild stomach upset if ingested and contact with foliage may aggravate skin allergies.

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

White, Mauve in Summer; Mauve, Red in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Flushed red, Dark-green in Autumn


How to care

Watch out for

Specific pests

Aphids , Capsid bug , Glasshouse red spider mite , Hydrangea scale

Diseases

Generally disease-free.

General care

Pruning

Pruning group 4 or 1.

Propagation methods

Softwood cuttings


Monthly care advice


Where to grow

Hydrangea serrata 'Grayswood' (Hydrangea 'Grayswood') will reach a height of 1.5m and a spread of 1.5m after 5-10 years.

Suggested uses

City, Cottage/Informal, Flower Arranging, Beds and borders, Low Maintenance, Containers

Cultivation

Plant in moist, but well-drained, soil in sun or partial shade. Soil ph will determine flower colour.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4), Tender in frost (H3)

USDA zones

Zone 9, Zone 8, Zone 7

Defra's Risk register #1

Plant name

Hydrangea serrata 'Grayswood' (Hydrangea 'Grayswood')

Common pest name

assam thrips; castor thrips; chilli thrips; yellow tea thrips

Scientific pest name

Scirtothrips dorsalis

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

4

General biosecurity comments

EU listed pest for citrus but highly polyphagous and intercepted on a number of hosts. EU legislation should be updated to reflect wider host list.

Defra's Risk register #2

Plant name

Hydrangea serrata 'Grayswood' (Hydrangea 'Grayswood')

Common pest name

Rice leaf nematode; Strawberry crimp disease nematode; White tip nematode; White tip nematode of rice

Scientific pest name

Aphelenchoides besseyi

Type

Nematode

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Damaging nematode affecting rice crops and strawberry production in warmer climates; could potentially present a threat to strawberry production and ornamental production in protected environments. But modern production practices seem to reduce likelihood of impacts. Pest is also regulated at EU level; which reduces likelihood of entry.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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This plant likes... Garden match
Soil types: Clay, Loamy, Sandy Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4), Tender in frost (H3) Tell us...

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