Bottlebrush Captain Cook

Sun

Full sun; light shade is tolerated but reduces flowering.

Water

Water regularly while establishing, then deeply during prolonged dry spells. Container plants need more frequent watering; never leave their pots standing in water.

Soil

Well-drained soil, preferably slightly acidic to neutral. Tolerates sandy soil and some clay provided drainage is good; strongly alkaline soil can cause yellow leaves.

Height

5-8 ft (1.5-2.4 m)

Spread

5-8 ft (1.5-2.4 m)

Flowers

Bright red flower spikes, mainly in spring and summer, with occasional repeat flowering into autumn in mild climates.

Foliage

Evergreen. Narrow, pointed green leaves on arching stems; young growth is often softly hairy.

Growth

Moderate

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife

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

Difficulty

Moderate

Toughness

Needs looking after

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

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.6 ft (0.79 m)

3. After 2 years

   4 ft (1.1 m)

4. After 3 years

   4 ft (1.4 m)

5. After 5 years

   6 ft (2 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

Growth rate

Moderate

• Water deeply through the first growing season, allowing the surface soil to dry slightly between waterings.
• Apply mulch over the root area, keeping it clear of the main stems.
• Feed lightly in spring with a low-phosphorus fertiliser suitable for Australian native plants; avoid heavy feeding.
• Use a free-draining potting mix and a container with unobstructed drainage holes.
• Move container plants into bright, frost-free shelter before sustained frosts, and water sparingly through winter.

Pruning. Lightly shorten flowered shoots just behind the spent flower spikes after the main flush finishes, leaving leafy growth below each cut. Remove dead or damaged wood in spring, and avoid hard pruning immediately before winter.

Early spring

Check for winter damage and remove dead stems once the risk of severe frost has passed.

Spring

Refresh mulch and apply a light feed if growth is weak or the plant is container-grown.

Spring

Plant after frost risk has passed, choosing a sunny position with good drainage.

Summer

Water new plants and containers during dry weather; lightly prune after the main flowering flush.

Late summer

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

Autumn

Move pots under frost-free cover where winters are cold; avoid pruning that encourages tender new growth.

Winter

Keep sheltered container plants in bright light and water only enough to prevent the root ball drying out completely.

• Use as a flowering specimen in a small, sunny garden, allowing room for its arching branches.
• Plant as a loose informal hedge or low screen in mild climates.
• Grow in a large courtyard container where its red flowers can be seen close up.
• Combine with westringia, lomandra and kangaroo paws in an Australian-native planting.
• Use behind low-growing plants in a sunny gravel border for evergreen structure and seasonal colour.

Garden styles it suits: Australian native, Coastal, Mediterranean, Wildlife garden, Modern courtyard and Dry gravel garden.

Plant it with: Coastal rosemary, Lomandra, Kangaroo paw, Flax lily, Lavender and Rock rose.

Wildlife: The nectar-rich flowers attract bees and nectar-feeding birds, including honeyeaters in Australia. Dense evergreen growth also provides shelter for small birds.

• Root rot in waterlogged soil: improve drainage, reduce watering and avoid planting in depressions that collect winter rain.
• Yellow leaves with greener veins on alkaline soil: check soil pH, apply an appropriate chelated iron treatment and consider container growing if the soil is strongly alkaline.
• 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 damage to leaves and shoot tips: protect young plants, shelter containers and wait until spring before cutting back damaged growth.

Not known to be toxic to cats, dogs, horses or people. No part is recognised as a significant poisoning hazard, but it is an ornamental plant rather than a food plant.

• Little John bottlebrush (Callistemon 'Little John')

  Usually much shorter and denser, with blue-green foliage and darker red flowers; 'Captain Cook' has greener leaves and a taller, more arching habit.

• Weeping bottlebrush (Callistemon viminalis)

  The ordinary species develops into a much larger shrub or tree with more strongly pendulous branches; 'Captain Cook' remains a compact, bushy shrub.

Callistemon comes from Greek words meaning 'beautiful stamen', referring to the showy flower filaments, while 'Captain Cook' honours the navigator James Cook.

Propagation. Take semi-ripe cuttings in late summer and root them in a free-draining medium with gentle warmth and humidity. Seed-grown plants will not reliably retain the cultivar's compact habit or other characteristics.

Accepted botanical name

Callistemon

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