Repotting guide

When & how to repot New Zealand Tree Fuchsia (Fuchsia excorticata)

Also called New Zealand Tree Fuchsia, Kotukutuku, Tree Fuchsia.

More about new zealand tree fuchsia

About New Zealand Tree Fuchsia

Fuchsia excorticata · also called New Zealand Tree Fuchsia, Kotukutuku · flowering

Fuchsia excorticata (kotukutuku) is endemic to New Zealand and holds the distinction of being the world's largest fuchsia species, capable of growing to 13 m with a trunk up to 70 cm in diameter. It is a deciduous tree with highly ornamental peeling copper to reddish-brown bark, and in spring it bears small green and deep purple flowers followed by dark edible berries; pollen is bright blue, another unusual trait. Outside New Zealand it is grown as a conservatory or greenhouse specimen in the UK, requiring frost-free winter protection, though it is hardy in the very mildest coastal gardens. The Fuchsia genus is listed as non-toxic to cats, dogs, and horses by the ASPCA.

Mature size: Up to 13 m tall in native habitat (43 ft); typically 3–5 m in UK garden or conservatory conditions.

Watch for — Frost Damage: Young plants and new spring growth are vulnerable to late frosts; protect with horticultural fleece when temperatures are forecast below 0°C and mulch the root zone heavily to protect from ground frost.

How to tell new zealand tree fuchsia needs repotting

Repotting on a calendar is less reliable than reading the plant. For new zealand tree fuchsia, watch for these signs:

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and new zealand tree fuchsia wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot new zealand tree fuchsia

Every 2–3 years; top-dress in the in-between years. New Zealand Tree Fuchsia's growth habit — deciduous tree with distinctive, papery, peeling bark; multiple-stemmed when young, developing a single trunk with age. — sets the pace. Fuchsia excorticata (kotukutuku) is endemic to New Zealand and holds the distinction of being the world's largest fuchsia species, capable of growing to 13 m with a trunk up to 70 cm in diameter. It is a deciduous tree with highly ornamental peeling copper to reddish-brown bark, and in spring it bears small green and deep purple flowers followed by dark edible berries; pollen is bright blue, another unusual trait. Outside New Zealand it is grown as a conservatory or greenhouse specimen in the UK, requiring frost-free winter protection, though it is hardy in the very mildest coastal gardens. The Fuchsia genus is listed as non-toxic to cats, dogs, and horses by the ASPCA.

What size pot to step new zealand tree fuchsia up to

Move up exactly one pot size. A heavy new zealand tree fuchsia dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot new zealand tree fuchsia

Early spring, just as new growth restarts, is the ideal window for new zealand tree fuchsia. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting new zealand tree fuchsia

Consider top-dressing first. If new zealand tree fuchsia is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh fertile, well-drained beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave new zealand tree fuchsia in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave new zealand tree fuchsia in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for new zealand tree fuchsia

New Zealand Tree Fuchsia wants fertile, well-drained. Plant in humus-rich, well-drained soil; apply a native plant or general-purpose granular fertiliser in spring and a 5–8 cm mulch of organic matter over the root zone to retain moisture. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting new zealand tree fuchsia — frequently asked questions

How often should you repot new zealand tree fuchsia?

Every 2–3 years; top-dress in the in-between years for new zealand tree fuchsia. Fully repot new zealand tree fuchsia only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with fertile, well-drained. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does new zealand tree fuchsia need?

When is the best time of year to repot new zealand tree fuchsia?

Should you top-dress or fully repot new zealand tree fuchsia?

For a big, heavy new zealand tree fuchsia, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise new zealand tree fuchsia after repotting?

Not immediately. Wait about 4 weeks after repotting new zealand tree fuchsia. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.