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Repotting guide

When & how to repot Noni (Morinda citrifolia)

Also called Noni, Indian mulberry, Great morinda.

More about noni

About Noni

Morinda citrifolia · also called Noni, Indian mulberry · tropical

Noni is a fast-growing tropical evergreen tree producing knobbly, pungent fruit used in traditional medicine and juices. It tolerates heat, salt and poor soils, thriving in full sun and high humidity in frost-free climates. It flowers and fruits almost continuously. In temperate areas grow it as a tender container plant kept above 15°C and brought indoors over winter.

Mature size: 3-6 m tall in the ground; readily kept to 1.5-2 m in a pot by pruning.

Watch for — Leaf spot and scale: Fungal spotting in stagnant humid air and occasional scale or mealybug; improve airflow and treat pests promptly.

How to tell noni needs repotting

Repotting on a calendar is less reliable than reading the plant. For noni, 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 noni

Every 2–3 years; top-dress in the in-between years. Noni's growth habit — erect, fast-growing evergreen shrub or small tree with large glossy leaves, white flowers and continuous knobbly green-to-yellow fruit; can become rangy without pruning. — sets the pace. Noni is a fast-growing tropical evergreen tree producing knobbly, pungent fruit used in traditional medicine and juices. It tolerates heat, salt and poor soils, thriving in full sun and high humidity in frost-free climates. It flowers and fruits almost continuously. In temperate areas grow it as a tender container plant kept above 15°C and brought indoors over winter.

What size pot to step noni up to

Move up exactly one pot size. A heavy noni 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 noni

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

  1. Consider top-dressing first. If noni 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 well-drained, even poor or sandy soil 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 noni in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave noni 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 noni

Noni wants well-drained, even poor or sandy soil. Adapts to a wide pH range (6.0-7.5) and tolerates saline, rocky and coastal soils. Drainage matters more than fertility; a free-draining loam-based mix suits containers. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting noni — frequently asked questions

How often should you repot noni?

Every 2–3 years; top-dress in the in-between years for noni. Fully repot noni 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 well-drained, even poor or sandy soil. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does noni need?

Move up exactly one pot size. A heavy noni 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 noni?

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

For a big, heavy noni, 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 noni after repotting?

Not immediately. Wait about 4 weeks after repotting noni. 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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