Repotting guide

When & how to repot Rotala indica (Rotala indica)

Also called Indian toothcup, Rotala indica.

More about rotala indica

About Rotala indica

Rotala indica · also called Indian toothcup, Rotala indica · tropical

A hardy, beginner-friendly aquascaping stem plant with small oval leaves that take on pink and reddish tones under bright light. Adaptable and fast-growing, it tolerates a wide range of water conditions and grows with or without CO2, making it a reliable background plant for both low-tech and high-tech freshwater aquariums.

Mature size: Stems grow 20-40 cm tall and will reach the surface; branches readily into a wide clump.

Watch for — Floating loose stems: Freshly planted cuttings lift before rooting. Anchor with plant weights or deeper planting until roots take hold.

How to tell rotala indica needs repotting

Repotting on a calendar is less reliable than reading the plant. For rotala indica, 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 rotala indica 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 rotala indica

Every 12–18 months — sooner if roots show fast. Rotala indica's growth habit — vigorous upright stem plant that branches and forms dense clusters; quick to fill a background and easy to keep bushy with regular trimming. — sets the pace. A hardy, beginner-friendly aquascaping stem plant with small oval leaves that take on pink and reddish tones under bright light. Adaptable and fast-growing, it tolerates a wide range of water conditions and grows with or without CO2, making it a reliable background plant for both low-tech and high-tech freshwater aquariums.

What size pot to step rotala indica up to

Step up one pot size — about 2–3 cm (an inch) wider. Rotala indica 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 rotala indica

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

Time it for spring. Repot rotala indica 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 rotala indica out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh aquarium gravel or aquasoil substrate 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 rotala indica 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 rotala indica

Rotala indica wants aquarium gravel or aquasoil substrate. Roots readily in gravel, sand or nutrient aquasoil. It draws nutrients mainly from the water column, so substrate choice is flexible. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rotala indica — frequently asked questions

How often should you repot rotala indica?

Every 12–18 months — sooner if roots show fast for rotala indica. Repot rotala indica 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 aquarium gravel or aquasoil substrate. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does rotala indica need?

When is the best time of year to repot rotala indica?

Can you put rotala indica straight into a much bigger pot?

No. Even a fast-growing rotala indica 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 rotala indica after repotting?

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