Manuka

Sun

Full sun gives the best flowering; light partial shade is tolerated.

Water

Water regularly while establishing. Established plants tolerate short dry spells, but prolonged drought and completely dry container compost can cause dieback.

Soil

Well-drained, acidic to neutral soil; avoid chalky soil and stagnant winter wet.

Height

6-16 ft (1.8-5 m), occasionally taller in favourable conditions

Spread

6-10 ft (1.8-3 m)

Flowers

Usually late spring to early summer; some plants flower earlier or over a longer period in mild climates. The species has white, occasionally pink flowers; garden cultivars also have pink or red, single or double flowers.

Foliage

Evergreen. Small, narrow, pointed leaves, usually dark green and aromatic when crushed; some cultivars have bronze or purple-tinted foliage.

Growth

Moderate

Care needed

Medium

• Pollinators
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   4 ft (1.1 m)

3. After 2 years

   5 ft (1.7 m)

4. After 3 years

   7 ft (2.2 m)

5. After 5 years

   11 ft (3.4 m)

   full size

About 5 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

Australia

Invasive in

the US

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Moderate

• Plant in spring where winters are cool, choosing a sunny position sheltered from cold, drying winds.
• Water deeply through the first growing season, allowing the surface soil to begin drying between waterings.
• Apply a shallow organic mulch, keeping it clear of the trunk.
• Feed lightly in spring only if growth is weak; avoid heavy feeding.
• Use a free-draining, lime-free potting mix in containers, and protect the root ball from freezing.

Pruning. Lightly trim leafy shoots immediately after flowering to keep the shrub dense. Avoid cutting into bare old wood, which often fails to produce new growth.

Spring

Plant after severe frost has passed and water new plants thoroughly.

Spring

Refresh mulch and check container plants for crowded roots or exhausted compost.

Late spring

Check new growth for aphids and scale insects; treat small infestations promptly.

Summer

Lightly trim after the main flowering flush and water during prolonged dry weather.

Late summer

Take semi-ripe cuttings from healthy, non-flowering shoots.

Autumn

Move containers into bright, frost-free shelter before damaging frosts.

Winter

Keep sheltered container plants barely moist and ensure outdoor plants are not sitting in waterlogged soil.

• Use as an informal flowering screen in a mild, sheltered coastal garden.
• Combine with heathers and hebes in a sunny, acidic-soil border for contrasting foliage textures.
• Grow a compact cultivar in a large courtyard container where its flowers and fine leaves can be seen closely.
• Use single-flowered forms in a pollinator border alongside plants that extend the flowering season.

Garden styles it suits: Coastal, Cottage garden, Wildlife garden, Pollinator garden, Modern courtyard and Australian native.

Plant it with: Hebe, Heather, New Zealand flax, New Zealand sedge and Kangaroo paw.

Wildlife: Single flowers provide nectar and pollen for bees and other insects. Dense established shrubs also offer shelter for small birds; double-flowered cultivars generally provide less accessible forage.

• Root rot and sudden decline in wet soil: improve drainage before planting and avoid standing water in container saucers.
• Drought-related browning: water the root zone deeply before the soil or potting mix dries out completely; dead branches may not recover.
• Scale insects and associated sooty mould: inspect stems and leaf undersides, remove small infestations by hand, and use a labelled horticultural oil if needed.
• Frost or cold-wind damage: choose a sheltered site, protect containers before freezing weather, and wait until spring growth starts before removing damaged tips.

The living plant is not known to be toxic to people, cats, dogs or horses, although species-specific safety information is limited. Leaves and stems are not intended as food, and swallowing plant material may cause stomach upset. Concentrated manuka essential oil should not be treated as safe for pets or swallowed.

Where it spreads. It has naturalised outside its native range and can spread invasively in Hawaii. Check local guidance before planting there, and remove unwanted seedlings before they establish.

• Kanuka (Kunzea robusta)

  Kanuka generally has softer foliage and smaller flowers grouped in clusters; manuka leaves feel pricklier and its larger flowers are usually borne singly.

• Coast tea tree (Leptospermum laevigatum)

  Coast tea tree has broader, blunt-tipped, grey-green leaves rather than manuka's narrow, sharply pointed leaves.

• Geraldton wax (Chamelaucium uncinatum)

  Geraldton wax has longer, needle-like leaves with hooked tips and conspicuously waxy flowers, rather than manuka's short, flat leaves and papery-looking petals.

Mānuka is its Māori name; Leptospermum means 'slender seed', while scoparium means 'broom-like'.

Propagation. Sow seed in spring, keeping it at the surface of a fine, moist seed mix. Take semi-ripe cuttings in summer to preserve a named cultivar; seedlings may differ from the parent.

Accepted botanical name

Leptospermum scoparium

In the US and Canada

Introduced in Hawaii.

Native range

Chatham Is., New South Wales, New Zealand North, New Zealand South, Tasmania and Victoria.

Measured

Average height 560 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.