Repotting guide

When & how to repot Seville orange (Citrus aurantium)

Also called Seville orange, Bitter orange, Sour orange, Bigarade.

More about seville orange

About Seville orange

Citrus aurantium · also called Seville orange, Bitter orange · edible

Seville orange is a bitter, aromatic citrus grown primarily for marmalade, liqueurs, and essential oil rather than fresh eating. One of the hardier ornamental citrus, it tolerates light frost briefly and makes a handsome specimen tree. The intensely fragrant blossom is used in perfumery. Toxic to pets due to citrus oils throughout the plant.

Mature size: 4-8 m in the ground; 1.5-3 m in large containers

Watch for — Thorns on grafted suckers: Vigorous thorny shoots from below the graft union are rootstock suckers. Remove them immediately at the point of origin — they will outcompete the scion if left.

How to tell seville orange needs repotting

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

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot seville orange on before it becomes hard root-bound.

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 seville orange

Pot on seedlings as they grow; not a perennial repot. Seville orangeis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Evergreen medium tree with a dense, thorny canopy.

What size pot to step seville orange up to

Pot seville orange 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 seville orange

Pot seville orange 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 seville orange

Pot on before it is root-bound. Check seville orange regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
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.
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.
Pot into rich mix. Set it into fresh well-drained, slightly acidic to neutral loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water seville orange 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 seville orange

Seville orange wants well-drained, slightly acidic to neutral loam. pH 6.0-7.0. Adaptable to a range of soils provided drainage is excellent. In the Mediterranean it grows on dry, stony hillsides. In the UK, use a citrus compost or loam-based mix with added grit in 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 seville orange — frequently asked questions

How often should you repot seville orange?

Pot on seedlings as they grow; not a perennial repot for seville orange. Seville orange is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into well-drained, slightly acidic to neutral loam 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 seville orange need?

When is the best time of year to repot seville orange?

Can you put seville orange straight into a much bigger pot?

No. Even a fast-growing seville orange 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 seville orange after repotting?

Not immediately. Wait about 1 week after repotting seville orange. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.