Repotting guide

When & how to repot Eggplant / aubergine (Solanum melongena)

Also called aubergine, brinjal, melongene.

About Eggplant / aubergine

Solanum melongena · also called aubergine, brinjal · edible

Eggplant (US) or aubergine (UK) is a warm-season Solanum grown for glossy fruit in purple, white, or striped. Needs heat — fruit set drops below 21°C. Start indoors early and grow in a greenhouse or sunny sheltered spot in cool climates. Foliage is toxic to pets.

Solanum melongena was domesticated in tropical Asia (India/Bangladesh and the surrounding region) from the wild S. insanum; it is a tender, frost-intolerant warm-season perennial grown as an annual.

Well-drained sandy loam to loam high in organic matter, pH about 5.8–6.5; black plastic mulch warms the soil and speeds maturity.

Mature size: 60-100 cm tall

Watch for — Pale undersized fruit: Under-feeding or root-bound in containers.

Sources: extension.umn.edu, hgic.clemson.edu, frontiersin.org

How to tell eggplant / aubergine needs repotting

Repotting on a calendar is less reliable than reading the plant. For eggplant / aubergine, 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 eggplant / aubergine 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 eggplant / aubergine

Pot on seedlings as they grow; not a perennial repot. Eggplant / aubergineis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Bushy upright annual.

What size pot to step eggplant / aubergine up to

Pot eggplant / aubergine 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 eggplant / aubergine

Pot eggplant / aubergine 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 eggplant / aubergine

Pot on before it is root-bound. Check eggplant / aubergine 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 rich well-drained 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 eggplant / aubergine 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 eggplant / aubergine

Eggplant / aubergine wants rich well-drained loam. Compost-rich; pH 6.0-6.8. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting eggplant / aubergine — frequently asked questions

How often should you repot eggplant / aubergine?

Pot on seedlings as they grow; not a perennial repot for eggplant / aubergine. Eggplant / aubergine is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich well-drained 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 eggplant / aubergine need?

When is the best time of year to repot eggplant / aubergine?

Can you put eggplant / aubergine straight into a much bigger pot?

No. Even a fast-growing eggplant / aubergine 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 eggplant / aubergine after repotting?

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