Repotting guide

When & how to repot Kaffir Lime (Citrus hystrix)

Also called kaffir lime, makrut lime, Thai lime.

More about kaffir lime

About Kaffir Lime

Citrus hystrix · also called kaffir lime, makrut lime · herb

Makrut lime is a small, thorny citrus tree grown chiefly for its intensely aromatic, double-lobed leaves, an essential flavouring in Thai, Cambodian, and Indonesian cooking, and for its bumpy, fragrant fruit zest. Tender and frost-sensitive, it is widely grown in containers and brought indoors over winter in cool climates, rewarding warmth, bright light, and steady moisture.

Mature size: Typically 1-3 m in containers; up to 5-6 m in the ground in frost-free climates

Watch for — Leaf drop from cold or overwatering: Sudden chills, drafts, or soggy roots cause leaves to yellow and drop. Keep above 10°C, away from cold windows and heaters, and let the soil surface dry between waterings.

How to tell kaffir lime needs repotting

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

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 kaffir lime

Every 2–3 years, into bone-dry mix. Kaffir Lime's growth habit — small, densely branched, thorny evergreen shrub or tree with distinctive glossy, hourglass-shaped double leaves and knobbly green fruit. — sets the pace. Makrut lime is a small, thorny citrus tree grown chiefly for its intensely aromatic, double-lobed leaves, an essential flavouring in Thai, Cambodian, and Indonesian cooking, and for its bumpy, fragrant fruit zest. Tender and frost-sensitive, it is widely grown in containers and brought indoors over winter in cool climates, rewarding warmth, bright light, and steady moisture.

What size pot to step kaffir lime up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Kaffir Lime stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 kaffir lime

Spring or summer, while kaffir lime is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting kaffir lime

Repot dry. Do not water kaffir lime for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty free-draining, slightly acidic citrus or loam-based mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set kaffir lime at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep kaffir lime completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for kaffir lime

Kaffir Lime wants free-draining, slightly acidic citrus or loam-based mix. Requires a gritty, fast-draining medium with a pH around 6.0-6.5; a dedicated citrus compost or loam-based mix amended with grit and bark is ideal. Sharp drainage is essential to avoid root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting kaffir lime — frequently asked questions

How often should you repot kaffir lime?

Every 2–3 years, into bone-dry mix for kaffir lime. Repot kaffir lime every 2–3 years into a snug pot of free-draining, slightly acidic citrus or loam-based mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does kaffir lime need?

When is the best time of year to repot kaffir lime?

Should you water kaffir lime after repotting?

No — not straight away. Repot kaffir lime into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise kaffir lime after repotting?

Not immediately. Wait about 3 weeks after repotting kaffir lime. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.