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Repotting guide

When & how to repot Lime Tree (Citrus × aurantiifolia)

Also called key lime, Mexican lime.

More about lime tree

About Lime Tree

Citrus × aurantiifolia · also called key lime, Mexican lime · edible

The key (Mexican) lime is a small, thorny, frost-tender citrus bearing aromatic, highly acidic green-to-yellow fruit famous in cooking and drinks. The most cold-sensitive common citrus, it suits warm gardens and conservatory or container culture elsewhere. It flowers and fruits over a long season, demands full sun and sharp drainage, and rewards steady citrus feeding with heavy crops.

Mature size: 2-4 m (6.5-13 ft) in the ground; usually kept to 1-2 m (3-6 ft) in containers with pruning.

Watch for — Leaf and fruit drop: Follows water stress, temperature swings, or low light. Keep watering even and the plant in a stable, bright, warm spot; a little natural fruit thinning is normal.

How to tell lime tree needs repotting

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

Pot on seedlings as they grow; not a perennial repot. Lime Treeis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Small, densely branched, thorny evergreen shrub or tree with a bushy, somewhat irregular habit. Ever-bearing in warm climates, with flowers and fruit at several stages at once..

What size pot to step lime tree up to

Pot lime tree on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

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 lime tree

Pot lime tree on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting lime tree

  1. Pot on before it is root-bound. Check lime tree regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
  3. Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
  4. Pot into rich mix. Set it into fresh light, fast-draining, slightly acidic citrus mix at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water lime tree in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for lime tree

Lime Tree wants light, fast-draining, slightly acidic citrus mix. A free-draining loam-based or peat-free citrus compost with grit or perlite, pH about 5.5-6.5. Excellent drainage is critical — limes are very prone to root rot in heavy, wet soil. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting lime tree — frequently asked questions

How often should you repot lime tree?

Pot on seedlings as they grow; not a perennial repot for lime tree. Lime Tree is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into light, fast-draining, slightly acidic citrus mix so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does lime tree need?

Pot lime tree on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. 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 lime tree?

Pot lime tree on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Can you put lime tree straight into a much bigger pot?

No. Even a fast-growing lime tree should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise lime tree after repotting?

Not immediately. Wait about 1 week after repotting lime tree. 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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