Lemon bottlebrush planting, care and pruning

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Brightly coloured stamens crowd into a dense cylindrical brush above evergreen leaves, giving lemon bottlebrush (Callistemon citrinus) its abundant, unmistakable flowering on a shrub of 3 to 10 feet. Give it a very sunny spot and well-draining soil that never leaves its roots soggy, and it flowers freely; in part shade you will have fewer blooms.

Care, from planting to pruning and watering, are steps that help your lemon bottle-brush grow lush.

Planting lemon bottlebrush

It is a good idea to plant lemon bottlebrush after the last frost spells, preferably late spring.

In Northernmost regions, favor growing lemon bottlebrush in containers so you can bring the pot inside, away from the freezing winter.

You can’t plant lemon bottlebrush outdoors in places with very cold winters.

• Lemon bottlebrush is hardy down to 20°F (-5°C)
• It prefers very sunny exposure
• In part shade, you’ll have less flowers.
• Well-draining soil is important: it doesn’t cope well with having wet roots in winter.

Growing lemon bottlebrush in a container:

For growing in pots, select a conventional shrub potting mix.

• Make sure the pot has proper drainage and a hole for water to drain away
• Add a layer of gravel or clay balls at the bottom to make sure water seeps out
• Water regularly, especially after planting
• Add fertilizer on a regular schedule: when growing in a container, soil will lose its nutrients fairly fast.

It is easy to propagate Callistemon bottlebrush through cuttings.

Pruning and caring for lemon bottlebrush

You can balance or reduce the breadth of your lemon bottlebrush in spring, pruning delicately.

To keep a compact appearance, prune the year’s new shoots back to half their length after the blooming.

In summer, eliminate fruits as they form because this uselessly tires the plant, and cut wilted stems.

• Bottlebrush usually resprouts from bare old wood thanks to epicormic buds and often a lignotuber, so it tolerates hard renovation pruning, though regrowth can be slow and flowering may be delayed a season or two.
• Prune each spent brush by cutting just behind it before the woody seed capsules harden, as these capsules cling to the stems for years once formed and are then far harder to remove.
• Use clean, sharp secateurs and avoid cutting late in the growing season, because the soft regrowth that follows a cut is easily damaged by frost on any shrub that is only marginally hardy where it grows.
• Spread a mulch of bark or compost over the root zone, keeping it clear of the trunk, to conserve summer moisture and reduce weeding around the shallow roots.

Lemon bottlebrush season by season

The jobs that matter for a lemon bottlebrush are all tied to a moment in the year. This table gathers the timings given above so you can see at a glance what to do and why.

Follow the calendar and the shrub keeps both its shape and its long spring-to-fall flowering.

Learn more about lemon bottlebrush

Its name is quite out-of-the-ordinary, but the bearing of this tree with abundant and unique blooming is magnificent.

Native to Asia, it is inclined towards rather mild climates when grown directly in the garden, but will adapt well to lean-ins and other greenhouses when potted.

You can increase the blooming by often adding liquid organic fertilizer, especially as an indoor plant when the soil tends to quickly lose its nutrients.