Repotting guide

When & how to repot Hydrocotyle leucocephala (Hydrocotyle leucocephala)

Also called Brazilian pennywort, white-head pennywort.

More about hydrocotyle leucocephala

About Hydrocotyle leucocephala

Hydrocotyle leucocephala · also called Brazilian pennywort, white-head pennywort · tropical

Hydrocotyle leucocephala, Brazilian pennywort, is a fast, easy stem plant with round scalloped leaves on long trailing stems. Hardy and undemanding, it grows submerged, floating or emersed and tolerates low light without CO2. It is excellent for absorbing excess nutrients and offering shade and cover, but needs regular trimming to control its rapid growth.

Mature size: Stems reach 30-50 cm or more; individual leaves about 2-4 cm across

Watch for — Leggy stems with sparse leaves: Usually too little light or nutrients; increase light and dose more nitrogen/potassium for fuller, more compact growth.

How to tell hydrocotyle leucocephala needs repotting

Repotting on a calendar is less reliable than reading the plant. For hydrocotyle leucocephala, 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 hydrocotyle leucocephala 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 hydrocotyle leucocephala

Every 12–18 months — sooner if roots show fast. Hydrocotyle leucocephala's growth habit — fast trailing/climbing stem plant; long stems with rounded scalloped leaves that grow up to and across the water surface. — sets the pace. Hydrocotyle leucocephala, Brazilian pennywort, is a fast, easy stem plant with round scalloped leaves on long trailing stems. Hardy and undemanding, it grows submerged, floating or emersed and tolerates low light without CO2. It is excellent for absorbing excess nutrients and offering shade and cover, but needs regular trimming to control its rapid growth.

What size pot to step hydrocotyle leucocephala up to

Step up one pot size — about 2–3 cm (an inch) wider. Hydrocotyle leucocephala 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 hydrocotyle leucocephala

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

Time it for spring. Repot hydrocotyle leucocephala 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 hydrocotyle leucocephala out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh aquatic substrate or none (floating) 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 hydrocotyle leucocephala 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 hydrocotyle leucocephala

Hydrocotyle leucocephala wants aquatic substrate or none (floating). Roots in most aquarium substrates and also grows perfectly well floating with roots in the water column. Feeds mainly through the water, so substrate type is not critical. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting hydrocotyle leucocephala — frequently asked questions

How often should you repot hydrocotyle leucocephala?

Every 12–18 months — sooner if roots show fast for hydrocotyle leucocephala. Repot hydrocotyle leucocephala 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 aquatic substrate or none (floating). Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does hydrocotyle leucocephala need?

When is the best time of year to repot hydrocotyle leucocephala?

Can you put hydrocotyle leucocephala straight into a much bigger pot?

No. Even a fast-growing hydrocotyle leucocephala 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 hydrocotyle leucocephala after repotting?

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