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Repotting guide

When & how to repot Wampee (Clausena lansium)

Also called Wampee, Wampi.

More about wampee

About Wampee

Clausena lansium · also called Wampee, Wampi · tropical

Wampee (Clausena lansium) is a small evergreen citrus-relative tree from southern China and Southeast Asia, bearing grape-like clusters of fuzzy, amber fruit with sweet-tart, aromatic flesh. More cold-tolerant than most tropical fruit, it suits warm subtropical as well as tropical gardens, fruits young and adapts well to container culture and pruning.

Mature size: Typically 3-7 m tall; easily kept to 2-3 m by pruning and well suited to large containers.

How to tell wampee needs repotting

Repotting on a calendar is less reliable than reading the plant. For wampee, watch for these signs:

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 wampee

Every 2–3 years; top-dress in the in-between years. Wampee's growth habit — small evergreen tree or large shrub with an upright, bushy, rounded crown of glossy aromatic pinnate leaves; fragrant white flower panicles give rise to drooping clusters of fuzzy oval fruit. — sets the pace. Wampee (Clausena lansium) is a small evergreen citrus-relative tree from southern China and Southeast Asia, bearing grape-like clusters of fuzzy, amber fruit with sweet-tart, aromatic flesh. More cold-tolerant than most tropical fruit, it suits warm subtropical as well as tropical gardens, fruits young and adapts well to container culture and pruning.

What size pot to step wampee up to

Move up exactly one pot size. A heavy wampee 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 wampee

Early spring, just as new growth restarts, is the ideal window for wampee. 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 wampee

  1. Consider top-dressing first. If wampee 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.
  2. 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.
  3. 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.
  4. Repot at the same depth. Add fresh fertile, free-draining loam beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
  5. Water and leave it put. Water thoroughly, then leave wampee in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave wampee 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 wampee

Wampee wants fertile, free-draining loam. Adapts to a range of soils, including sandy and loamy types, with a slightly acidic to neutral pH (about 5.5-7.0). Like its citrus relatives, it needs good drainage. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting wampee — frequently asked questions

How often should you repot wampee?

Every 2–3 years; top-dress in the in-between years for wampee. Fully repot wampee 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, free-draining loam. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does wampee need?

Move up exactly one pot size. A heavy wampee 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. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot wampee?

Early spring, just as new growth restarts, is the ideal window for wampee. 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.

Should you top-dress or fully repot wampee?

For a big, heavy wampee, 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 wampee after repotting?

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

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