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Acacia dealbata (Mimosa )

Intermediate
skill rating
2 hours care
per year
25m
Max height
10m
Max spread
10-20 years
To maturity
Low
Toxicity

Plant details

Botanical name

Acacia dealbata

Other names

Silver wattle, Mimosa , Blue wattle

Genus

Acacia Acacia

Species

A. dealbata - A. dealbata is tender, open, evergreen shrub or small tree with pinnate, hairy leaves divided into numerous linear, grey-green leaflets. Racemes of spherical, fragrant, yellow flower heads bloom from winter into spring.


Acacia dealbata is: Evergreen

Habit

Open branches

Toxicity

All parts may cause severe discomfort if ingested.

Awards

RHS AGM (Award of Garden Merit)

Flower

Yellow in Spring; 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 or, if wall trained, pruning group 13. Does not respond well to hard pruning.

Propagation methods

Semi-hardwood cuttings


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Where to grow

Acacia dealbata (Mimosa ) will reach a height of 25m and a spread of 10m after 10-20 years.

Suggested uses

Containers, Beds and borders, Cottage/Informal, City, Wallside and trellises

Cultivation

In frost free areas, grow in neutral to acid soil in a sheltered, sunny site. Elsewhere, needs winter protection. Under glass, grow in ericaceous or loam-based compost in full light.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid, Neutral

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 unheated (H2)

Companion plants

Botanical name

Acacia dealbata

Other names

Silver wattle, Mimosa , Blue wattle

Genus

Acacia Acacia

Species

A. dealbata - A. dealbata is tender, open, evergreen shrub or small tree with pinnate, hairy leaves divided into numerous linear, grey-green leaflets. Racemes of spherical, fragrant, yellow flower heads bloom from winter into spring.

Foliage

Evergreen

Habit

Open branches

Toxicity

All parts may cause severe discomfort if ingested.

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

Yellow in Spring; 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 or, if wall trained, pruning group 13. Does not respond well to hard pruning.

Propagation methods

Semi-hardwood cuttings


Monthly care advice


Where to grow

Acacia dealbata (Mimosa ) will reach a height of 25m and a spread of 10m after 10-20 years.

Suggested uses

Containers, Beds and borders, Cottage/Informal, City, Wallside and trellises

Cultivation

In frost free areas, grow in neutral to acid soil in a sheltered, sunny site. Elsewhere, needs winter protection. Under glass, grow in ericaceous or loam-based compost in full light.

Soil type

Loamy, Sandy

Soil drainage

Well-drained

Soil pH

Acid, Neutral

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 unheated (H2)

USDA zones

Zone 10, Zone 9, Zone 8

Defra's Risk register #1

Plant name

Acacia dealbata (Mimosa )

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 dealbata (Mimosa )

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.

Defra's Risk register #3

Plant name

Acacia dealbata (Mimosa )

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.

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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Acacia dealbata (Mimosa )

Coming back from frostbitten death (02/10/2010)

(27/02/2011)

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This plant likes... Garden match
Soil types: Loamy, Sandy Tell us...
Soil drainage: Well-drained Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Tender in frost (H3), Indoor unheated (H2) Tell us...

DISCUSS THIS PLANT

Never flowered?

My tree is in a very large container and is about three years old but has never flowered? When will it be llikely to do so? read more

Tender Frost?

This tree, when planted outdoors can cope with winter temperatures down to minus 10 Celsius, as I see every winter in my garden in Catalonia. read more

There are 15 active discussions about Acacia dealbata (Mimosa )

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