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Acacia koa (Koa)

Intermediate
skill rating
2 hours care
per year
24m
Max height
12m
Max spread
20-50 years
To maturity
Low
Toxicity

Plant details

Botanical name

Acacia koa

Other names

Koa

Genus

Acacia Acacia

Species

A. koa - A. koa is a dense, vigorous yet tender, wide-spreading, evergreen tree with sickle-shaped, grey-green leaves and racemes of spherical, pale yellow flower heads from late winter to early summer, year-round in ideal growing conditions. Flowers are followed by flat green seed pods ripening brown.


Acacia koa is: Evergreen

Habit

Dense, Spreading

Toxicity

All parts may cause severe discomfort if ingested.

Flower

Pale-yellow in Spring; Pale-yellow in Summer; Pale-yellow in Winter

Foliage

Grey-green in All seasons

How to care

Watch out for

Pests

Generally pest free.

Specific pests

Mealybugs , Glasshouse red spider mite , Scale insects Mealybugs , Glasshouse red spider mite , Scale insects

Diseases

Generally disease free.

General care

Pruning

Pruning group 8. Will need regular, restrictive pruning if grown under glass.

Propagation methods

Seed


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Where to grow

Acacia koa (Koa) will reach a height of 24m and a spread of 12m after 20-50 years.

Suggested uses

Sub-Tropical, Specimen tree, City

Cultivation

In frost free areas, grow in strongly acid, well-drained or moist but well-drained soil in full sun. Elsewhere, needs winter protection. Under glass, grow in ericaceous compost in full light. Native to Hawaii.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid

Light

Full Sun

Aspect

South, West

Exposure

Sheltered

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

Tender in frost (H3), Indoor heated (H1)

Companion plants

Botanical name

Acacia koa

Other names

Koa

Genus

Acacia Acacia

Species

A. koa - A. koa is a dense, vigorous yet tender, wide-spreading, evergreen tree with sickle-shaped, grey-green leaves and racemes of spherical, pale yellow flower heads from late winter to early summer, year-round in ideal growing conditions. Flowers are followed by flat green seed pods ripening brown.

Foliage

Evergreen

Habit

Dense, Spreading

Toxicity

All parts may cause severe discomfort if ingested.


Colour

Flower

Pale-yellow in Spring; Pale-yellow in Summer; Pale-yellow in Winter

Foliage

Grey-green in All seasons


How to care

Watch out for

Pests

Generally pest free.

Specific pests

Mealybugs , Glasshouse red spider mite , Scale insects

Diseases

Generally disease free.

General care

Pruning

Pruning group 8. Will need regular, restrictive pruning if grown under glass.

Propagation methods

Seed


Monthly care advice


Where to grow

Acacia koa (Koa) will reach a height of 24m and a spread of 12m after 20-50 years.

Suggested uses

Sub-Tropical, Specimen tree, City

Cultivation

In frost free areas, grow in strongly acid, well-drained or moist but well-drained soil in full sun. Elsewhere, needs winter protection. Under glass, grow in ericaceous compost in full light. Native to Hawaii.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid

Light

Full Sun

Aspect

South, West

Exposure

Sheltered

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

Tender in frost (H3), Indoor heated (H1)

USDA zones

Zone 11, Zone 10

Defra's Risk register #1

Plant name

Acacia koa (Koa)

Common pest name

Scientific pest name

Hylesia nigricans

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

South American moth which could be damaging to broadleaf species if introduced to the UK; as well as having human health impacts. The main pathway is likely to be goods (including non-plant material) imported from South America and awareness raising with the main industry sectors is recommended.

Defra's Risk register #2

Plant name

Acacia koa (Koa)

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 #3

Plant name

Acacia koa (Koa)

Common pest name

Asain cotton leafworm; Cluster caterpillar; Fall armyworm; Rice cutworm; Taro caterpiller; Tobacco budworm; Tobacco caterpillar; Tobacco cutworm; Tobacco leaf caterpillar

Scientific pest name

Spodoptera litura

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

Regulated pest; frequently intercepted with occasional outbreaks which have been successfully eradicated in the UK.

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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Soil types: Loamy, Sandy Tell us...
Soil drainage: Well-drained Tell us...
Soil pH: Acid Tell us...
Light: Full Sun Tell us...
Aspect: South, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Tender in frost (H3), Indoor heated (H1) Tell us...

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