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Wisteria macrostachya (Kentucky wisteria)

Intermediate
skill rating
2 hours care
per year
8m
Max height
3m
Max spread
10-20 years
To maturity
Low
Toxicity

Plant details

Botanical name

Wisteria macrostachya

Other names

Kentucky wisteria, American wisteria

Genus

Wisteria Wisteria

Species

W. macrostachya - W. macrostachya is a vigorous, twining, woody, deciduous climber bearing pinnate, dark green leaves with ovate, veined leaflets and, from late spring or early summer as the leaves emerge, racemes of purple-blue flowers in spring followed by velvety, green seed pods.


Wisteria macrostachya is: Deciduous

Habit

Climbing

Toxicity

All parts may cause severe discomfort if ingested.

Flower

Blue, Purple in Spring; Blue, Purple in Summer

Foliage

Green in Spring; Dark-green in Summer; Dark-green in Autumn

How to care

Watch out for

Specific pests

Scale insects Scale insects

Leaf spot , Powdery mildew Leaf spot , Powdery mildew

General care

Propagation methods

Grafting, Hardwood cuttings, Layering, Softwood cuttings


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Where to grow

Wisteria macrostachya (Kentucky wisteria) will reach a height of 8m and a spread of 3m after 10-20 years.

Suggested uses

Wallside and trellises

Cultivation

Grow in moist but well-drained, acid to neutral soil in full sun or partial shade. Flowering is best in full sun. Grow informally through a large tree or formally against a wall or over a pergola. Site carefully as needs strong support and may become inva

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained

Soil pH

Acid, Neutral

Light

Partial Shade, Full Sun

Aspect

South, West

Exposure

Sheltered

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

Hardy (H4)

Companion plants

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

Botanical name

Wisteria macrostachya

Other names

Kentucky wisteria, American wisteria

Genus

Wisteria Wisteria

Species

W. macrostachya - W. macrostachya is a vigorous, twining, woody, deciduous climber bearing pinnate, dark green leaves with ovate, veined leaflets and, from late spring or early summer as the leaves emerge, racemes of purple-blue flowers in spring followed by velvety, green seed pods.

Foliage

Deciduous

Habit

Climbing

Toxicity

All parts may cause severe discomfort if ingested.


Colour

Flower

Blue, Purple in Spring; Blue, Purple in Summer

Foliage

Green in Spring; Dark-green in Summer; Dark-green in Autumn


How to care

Watch out for

Specific pests

Scale insects

Specific diseases

Leaf spot , Powdery mildew

General care

Propagation methods

Grafting, Hardwood cuttings, Layering, Softwood cuttings


Monthly care advice


Where to grow

Wisteria macrostachya (Kentucky wisteria) will reach a height of 8m and a spread of 3m after 10-20 years.

Suggested uses

Wallside and trellises

Cultivation

Grow in moist but well-drained, acid to neutral soil in full sun or partial shade. Flowering is best in full sun. Grow informally through a large tree or formally against a wall or over a pergola. Site carefully as needs strong support and may become inva

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained

Soil pH

Acid, Neutral

Light

Partial Shade, Full Sun

Aspect

South, West

Exposure

Sheltered

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

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Wisteria macrostachya (Kentucky wisteria)

Common pest name

pink wax scale; red was scale; ruby wax scale

Scientific pest name

Ceroplastes rubens

Type

Insect

Current status in UK

Absent

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

3

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

3

General biosecurity comments

Based on its biology and low potential impact continued action on this pest in the UK would not be considered appropriate. It is likely to be of more concern to southern Member States of the EU; as it is an economic pest of citrus.

Defra's Risk register #2

Plant name

Wisteria macrostachya (Kentucky wisteria)

Common pest name

Nematode; common spiral; Spiral nematode; Steiners spiral nematode

Scientific pest name

Helicotylenchus dihystera

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

Nematode pest unlikely to be very damaging in its own right; but used as a an indicator species to assess compliance of soil requirements of imported plants to be kept under review in light of EFSA evaluation of soil requirements.

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: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: South, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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