Repotting guide

When & how to repot Hygrophila corymbosa (Hygrophila corymbosa)

Also called giant hygro, temple plant.

More about hygrophila corymbosa

About Hygrophila corymbosa

Hygrophila corymbosa · also called giant hygro, temple plant · tropical

Hygrophila corymbosa, giant hygro or temple plant, is a large, robust stem plant with broad lance-shaped leaves on thick upright stems. It grows quickly to fill a tank background, tolerates a wide range of conditions, and can grow emersed with flowers above water. Hardy and forgiving, it suits larger aquariums and beginners alike.

Mature size: Stems to 40-60 cm tall, leaves up to 10-12 cm long

Watch for — Nutrient-deficiency holes/yellowing: Pinholes and yellow lower leaves indicate potassium or nitrogen shortfall in this heavy feeder; increase dosing and add root tabs.

How to tell hygrophila corymbosa needs repotting

Repotting on a calendar is less reliable than reading the plant. For hygrophila corymbosa, 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 hygrophila corymbosa 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 hygrophila corymbosa

Every 12–18 months — sooner if roots show fast. Hygrophila corymbosa's growth habit — large, fast-growing erect stem plant with big opposite lance-shaped leaves; forms a tall, full background and can break the surface and flower emersed. — sets the pace. Hygrophila corymbosa, giant hygro or temple plant, is a large, robust stem plant with broad lance-shaped leaves on thick upright stems. It grows quickly to fill a tank background, tolerates a wide range of conditions, and can grow emersed with flowers above water. Hardy and forgiving, it suits larger aquariums and beginners alike.

What size pot to step hygrophila corymbosa up to

Step up one pot size — about 2–3 cm (an inch) wider. Hygrophila corymbosa 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 hygrophila corymbosa

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

Time it for spring. Repot hygrophila corymbosa 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 hygrophila corymbosa out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh nutrient aquarium substrate (rooted stem plant) 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 hygrophila corymbosa 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 hygrophila corymbosa

Hygrophila corymbosa wants nutrient aquarium substrate (rooted stem plant). Root the heavy stems in gravel or aquasoil; a nutrient-rich substrate plus root tabs supports its large fast growth. Also grows emersed in waterlogged marginal 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 hygrophila corymbosa — frequently asked questions

How often should you repot hygrophila corymbosa?

Every 12–18 months — sooner if roots show fast for hygrophila corymbosa. Repot hygrophila corymbosa 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 nutrient aquarium substrate (rooted stem plant). Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does hygrophila corymbosa need?

When is the best time of year to repot hygrophila corymbosa?

Can you put hygrophila corymbosa straight into a much bigger pot?

No. Even a fast-growing hygrophila corymbosa 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 hygrophila corymbosa after repotting?

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