Repotting guide

When & how to repot Calanthe sylvatica (Calanthe sylvatica)

Also called Forest Calanthe, African Calanthe.

More about calanthe sylvatica

About Calanthe sylvatica

Calanthe sylvatica · also called Forest Calanthe, African Calanthe · tropical

Calanthe sylvatica is an evergreen, terrestrial forest orchid from African and Asian woodlands, prized for tall spikes of violet to mauve flowers above broad, pleated leaves. Unlike epiphytic orchids, it roots in humus-rich soil and tolerates lower light, making it a rewarding shade-loving species for warm, humid, frost-free conditions.

Mature size: Roughly 40-70 cm tall in flower, with leaves to 30-40 cm long; spreads slowly into a clump over several years.

Watch for — Pseudobulb and root rot: Soggy, poorly draining mix rots the fleshy bases. Use an open terrestrial mix and let the surface dry slightly between waterings.

How to tell calanthe sylvatica needs repotting

Repotting on a calendar is less reliable than reading the plant. For calanthe sylvatica, 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 calanthe sylvatica 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 calanthe sylvatica

Every 12–18 months — sooner if roots show fast. Calanthe sylvatica's growth habit — evergreen terrestrial orchid forming clumps of pseudobulbs with broad, pleated, plicate leaves; sends up erect flower spikes from the base bearing many violet-to-mauve blooms. — sets the pace. Calanthe sylvatica is an evergreen, terrestrial forest orchid from African and Asian woodlands, prized for tall spikes of violet to mauve flowers above broad, pleated leaves. Unlike epiphytic orchids, it roots in humus-rich soil and tolerates lower light, making it a rewarding shade-loving species for warm, humid, frost-free conditions.

What size pot to step calanthe sylvatica up to

Step up one pot size — about 2–3 cm (an inch) wider. Calanthe sylvatica 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 calanthe sylvatica

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

Time it for spring. Repot calanthe sylvatica 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 calanthe sylvatica out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh humus-rich, free-draining terrestrial orchid or woodland 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 calanthe sylvatica 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 calanthe sylvatica

Calanthe sylvatica wants humus-rich, free-draining terrestrial orchid or woodland mix. Blend fine bark, leaf mould or coir, perlite and a little loam to mimic forest-floor humus. The mix must drain freely while holding moisture; avoid dense, waterlogging composts that rot the fleshy pseudobulbs and roots. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting calanthe sylvatica — frequently asked questions

How often should you repot calanthe sylvatica?

Every 12–18 months — sooner if roots show fast for calanthe sylvatica. Repot calanthe sylvatica 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, free-draining terrestrial orchid or woodland mix. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does calanthe sylvatica need?

When is the best time of year to repot calanthe sylvatica?

Can you put calanthe sylvatica straight into a much bigger pot?

No. Even a fast-growing calanthe sylvatica 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 calanthe sylvatica after repotting?

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