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Shrubs

Boronia heterophylla

red boronia

A tender, upright, bushy, evergreen shrub with narrow, needle-like, aromatic, mid-green leaves. In spring to early summer it bears clusters of pendent, bell-shaped, dark pink flowers along the branches.

Other common names

kalgan

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Ultimate height

1–1.5 metres

Time to ultimate height

5–10 years

Ultimate spread

1–1.5 metres

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Sheltered

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: Rutaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Spreading branched, Bushy
Genus: Boronia are shrubs with evergreen, often aromatic, foliage and cup- or bell-shaped flowers borne singly or in clusters
Name status: Correct
Plant range: SW Australia

How to grow

Cultivation

Under glass grow in lime-free (ericaceous) potting compoost in full light with shade from hot sun. Provide good ventilation. When in growth, water moderately, applying a phosphate-free liquid fertiliser once a month; water sparingly in winter. Outdoors, cultivate in moist but well-drained, ideally sandy, neutral to acid soil in full sun, provide the plants with a cool root run.

Propagation

Sow seed at 16°C (61°F) in spring. Propagate by semi-ripe cuttings in a propagating case with bottom heat in summer.

Suggested planting locations and garden types

City and courtyard gardens
Conservatory and greenhouse
Wall side borders

Pruning

pruning group 10

Pests

May be susceptible to glasshouse red spider mite.

Diseases

Generally disease-free.

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