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TreesShrubs

Acacia dealbata subsp. subalpina

subalpine blue wattle

An evergreen tree, to around 8m, with beautiful fern-like silver green leaves. The fluffy flowers in spring are bright yellow and fragrant..

Other common names

subalpine mimosa

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Ultimate height

4–8 metres

Time to ultimate height

10–20 years

Ultimate spread

2.5–4 metres

Clay

Loam

Sand

Moisture

Well–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

East–facing or North–facing or South–facing or West–facing

Exposure

Sheltered

Drought resistance

Yes

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Fabaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Columnar upright, Spreading branched
Genus: Acacia can be deciduous or evergreen trees, shrubs or climbers, with alternate, pinnately divided leaves or simple modified leaf-like stalks (phyllodes), and tiny, sometimes fragrant, flowers in short spikes, or in racemes or spikes of spherical heads
Name status: Correct

How to grow

Cultivation

Grow outdoors in neutral to acid well-drained soil in sheltered location with full sun. Suits coastal, courtyard and urban gardens in milder locations, but may need winter protection elsewhere. It is smaller in every respect than Acacia dealbata, but hardier. Resents hard pruning. For more advice see tree cultivation

Propagation

Propagate by semi-hardwood cuttings or seed. For more advice see Propagate by seed

Suggested planting locations and garden types

Architectural
City and courtyard gardens
Mediterranean climate plants

Pruning

Pruning group 1

Pests

May be susceptible to glasshouse red spider mite, fluted scale and mealybugs

Diseases

May be susceptible to honey fungus

Get involved

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