Repotting guide

When & how to repot Coleus (Solenostemon scutellarioides)

Also called coleus, painted nettle, flame nettle, poor man's croton.

More about coleus

About Coleus

Solenostemon scutellarioides · also called coleus, painted nettle · houseplant

Solenostemon scutellarioides (syn. Plectranthus scutellarioides) is an exuberantly colourful tropical foliage plant available in an enormous range of leaf patterns — reds, oranges, pinks, yellows, and purples. Grown as a tender perennial or annual, it thrives in bright conditions, grows rapidly, and is easily propagated from cuttings. Toxic to cats, dogs, and horses via essential oils.

Mature size: 30–90 cm tall (12–36 in) and 30–60 cm wide (12–24 in), depending on cultivar

Watch for — Sudden wilting: Coleus wilts fast under drought stress but usually recovers after watering. Persistent wilting despite moist soil indicates root rot or root damage. Check roots and repot if necessary, cutting away any black, mushy sections.

How to tell coleus needs repotting

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

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new coleus leaves are noticeably smaller than older ones despite good light.

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 coleus

Every 12–18 months — sooner if roots show fast. Coleus's growth habit — bushy, upright annual or tender perennial subshrub; rapid grower that benefits from regular pinching to maintain compact form — sets the pace. Solenostemon scutellarioides (syn. Plectranthus scutellarioides) is an exuberantly colourful tropical foliage plant available in an enormous range of leaf patterns — reds, oranges, pinks, yellows, and purples. Grown as a tender perennial or annual, it thrives in bright conditions, grows rapidly, and is easily propagated from cuttings. Toxic to cats, dogs, and horses via essential oils.

What size pot to step coleus up to

Step up one pot size — about 2–3 cm (an inch) wider. Coleus grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 coleus

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

Time it for spring. Repot coleus in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip coleus out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh humus-rich, moist but well-draining potting mix in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water coleus once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for coleus

Coleus wants humus-rich, moist but well-draining potting mix. A peat-free potting compost enriched with perlite (4:1) provides the moisture retention and aeration coleus needs. Slightly acidic to neutral pH (6.0–7.0). Avoid heavy or poorly draining soils, as the roots are susceptible to waterlogging. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting coleus — frequently asked questions

How often should you repot coleus?

Every 12–18 months — sooner if roots show fast for coleus. Repot coleus roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh humus-rich, moist but well-draining potting mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does coleus need?

When is the best time of year to repot coleus?

Can you put coleus straight into a much bigger pot?

No. Even a fast-growing coleus 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 coleus after repotting?

Not immediately. Wait about 4 weeks after repotting coleus. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.