Hydrangea seemannii (Climbing evergreen hydrangea)

Botanical name

Hydrangea seemannii

Other names

Climbing evergreen hydrangea, Mexican climbing hydrangea, Seemann's hydrangea

Genus

Hydrangea Hydrangea

Species

H. seemannii - H. seemannii is a vigorous, woody, borderline hardy, evergreen climber with aerial roots, leathery, glossy, elliptic, dark green leaves, and, in summer, domed clusters of greenish-white fertile flowers surrounded by white sterile flowers.

Native to

Mexico

Foliage

Evergreen

Fragrance

The flowers' fragrance is strongest in the evening.

Habit

Climbing, Twining

Colour

Flower

White in Summer

Foliage

Dark-green in All seasons

How to care

Watch out for

Specific pests

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

General care

Pruning

Pruning group 11 after flowering.

Propagation

Layer in spring. Take semi-ripe cuttings of non-flowering shoots in summer.

Propagation methods

Layering, Semi-ripe cuttings

Monthly care advice

Where to grow

Hydrangea seemannii (Climbing evergreen hydrangea) will reach a height of 10m and a spread of 4m after 10-20 years.

Suggested uses

Low Maintenance, Cottage/Informal, City, Wallside and trellises

Cultivation

Grow in moderately fertile, humus-rich, moist but well-drained soil in full sun to full shade. Shelter from cold, drying winds and protect from prolonged and/or hard frosts. May become chlorotic in chalky soils.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Shade, Full Sun

Aspect

North, South, East, West

Exposure

Sheltered

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

Hardy (H4), Tender in frost (H3)

USDA zones

Zone 10, Zone 9, Zone 8

Defra's Risk register #1

Plant name

Hydrangea seemannii (Climbing evergreen hydrangea)

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 seemannii (Climbing evergreen hydrangea)

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