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Kunzea ambigua

butterfly bush

Myrtaceae Southeastern Australia

Attracts Pollinators Attracts Butterflies Drought Tolerant Fragrant (moderate)

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 9–11

Overview

Kunzea ambigua is an evergreen shrub reaching 6-13 feet (2-4 m) tall with an arching, bushy habit and slender branches. The small leaves are linear to narrow-oblong, 0.2-0.5 inch (5-12 mm) long, crowded along the stems, and aromatic when crushed. Masses of small white flowers, each about 0.3 inch (8 mm) across with prominent stamens that give a fluffy appearance, are borne in clusters along the branches in late spring and early summer. The flowers are fragrant and rich in nectar. The fruit is a small woody capsule. Growth is fast and plants are moderately short-lived, often lasting 10-15 years. The species tolerates sandy and rocky soils, salt-laden coastal wind, and light frost but is sensitive to prolonged waterlogging.

Native Range

Native to southeastern Australia, in coastal and near-coastal New South Wales, Victoria, and Tasmania. Grows in heath, coastal scrub, and dry forest on sandy and rocky soils, often in exposed sites near the sea.

Suggested Uses

Used as a screening and windbreak shrub in coastal and native gardens, spaced 5-8 feet (1.5-2.4 m) apart. The fragrant flowers suit habitat and pollinator plantings. Fast growth and short lifespan make it useful for quick screening rather than as a long-term planting.

How to Identify

Identified by crowded small aromatic leaves 0.2-0.5 inch (5-12 mm) long and dense clusters of small white flowers with long stamens that give a fluffy look in late spring. The fragrant white flowers and arching habit distinguish it from tea-trees (Leptospermum spp.), which have larger, flatter flowers with five distinct petals.

Appearance

Size & Dimensions

Height6' - 13'

Width/Spread6' - 13'

Reaches mature size in approximately 3 years

Colors

Flower Colors

white

Foliage Colors

green

Fall Foliage Colors

no change

Bloom Information

Bloom Period

~4 weeks

Spring Summer

Flowers in late spring and early summer, mainly October to December. The fragrant white flowers are massed along the branches and last 3-4 weeks. Flowering attracts bees, butterflies, and other insects.

Detailed Descriptions

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.0 - 7.0(Neutral)

357912

Soil Types

sand rocky loam

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

2-3 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Grows in full sun in sandy or rocky, well-drained soils and tolerates coastal wind and salt spray. Established plants are drought-tolerant and need watering only in extended dry spells. Light frost is tolerated, but prolonged waterlogging causes root problems. Growth is fast and plants respond to pruning with dense regrowth. Few pests affect it. Plants are moderately short-lived and may be replaced after 10-15 years.

Pruning

Prune after flowering to maintain a compact shape and prolong plant life. The species tolerates moderate pruning into leafy wood and resprouts well. Regular trimming prevents the open, leggy form that develops with age.

Pruning Schedule

summer