Repotting guide

When & how to repot Long-lipped Tongue Orchid (Serapias vomeracea)

Also called Long-lipped Tongue Orchid, Tongue Orchid.

More about long-lipped tongue orchid

About Long-lipped Tongue Orchid

Serapias vomeracea · also called Long-lipped Tongue Orchid, Tongue Orchid · flowering

Serapias vomeracea is a terrestrial orchid native to the Mediterranean Basin, from Portugal and southern France through Italy to the Balkans and Turkey, producing upright spikes of distinctive, rich dark-pink to reddish-purple hooded flowers with a long, protruding tongue-like lip in spring. It grows from paired underground tubers in poor, free-draining, calcareous grassland and open scrub, and requires a specialised Mediterranean dry-summer, wet-winter climate to thrive. The most important care fact is that it depends on specific mycorrhizal fungi in the soil and does not transplant or grow in containers without them. Orchids in the genus Serapias are not reported as toxic to pets.

Mature size: 20–50 cm tall in flower; non-spreading (each tuber produces one stem and replaces itself annually)

Watch for — Tuber rot from summer moisture: The most frequent cause of failure in cultivation: tubers kept wet during the summer dormancy period rot rapidly. Lift pot-grown tubers or ensure outdoor beds drain completely dry by June; store or leave them in bone-dry conditions until late September.

How to tell long-lipped tongue orchid needs repotting

Repotting on a calendar is less reliable than reading the plant. For long-lipped tongue orchid, watch for these signs:

The bark medium has broken down into a dark, soggy, soil-like mush that no longer drains.
Roots are climbing out of the pot in all directions (this is normal for long-lipped tongue orchid and not on its own a reason to repot).
Roots inside the pot are brown, soft and rotting rather than firm and green/silver.
It is about two years since the last repot, or you can smell sour, decomposing bark — repot just after flowering finishes.

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 long-lipped tongue orchid

Every 1–2 years, when the bark breaks down. Long-lipped Tongue Orchid's growth habit — deciduous terrestrial orchid growing from paired underground tubers; erect, single unbranched stem 20–50 cm tall with keeled, grey-green leaves sheathing the base, bearing a terminal spike of 3–10 flowers. — sets the pace. Serapias vomeracea is a terrestrial orchid native to the Mediterranean Basin, from Portugal and southern France through Italy to the Balkans and Turkey, producing upright spikes of distinctive, rich dark-pink to reddish-purple hooded flowers with a long, protruding tongue-like lip in spring. It grows from paired underground tubers in poor, free-draining, calcareous grassland and open scrub, and requires a specialised Mediterranean dry-summer, wet-winter climate to thrive. The most important care fact is that it depends on specific mycorrhizal fungi in the soil and does not transplant or grow in containers without them. Orchids in the genus Serapias are not reported as toxic to pets.

What size pot to step long-lipped tongue orchid up to

Keep long-lipped tongue orchid in the same size pot, or go up just one, only if the roots have genuinely outgrown it. Orchids flower better slightly snug, and a big pot of bark stays wet and rots the roots. The reason you are repotting is the broken-down bark, not a need for more space — a clear pot lets you watch the roots.

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 long-lipped tongue orchid

Repot long-lipped tongue orchid immediately after the flowers have finished, just as new roots or a new growth start to emerge — those fresh roots establish quickly in new bark. Never repot an orchid in full bloom; you will drop the flowers and shock the plant.

Step-by-step: repotting long-lipped tongue orchid

Repot after flowering. Wait until long-lipped tongue orchid has finished blooming and is pushing new roots. Soak the pot first so the roots are pliable and less likely to snap.
Remove all the old bark. Slide the plant out and crumble away every scrap of broken-down bark — that soggy mush is the actual problem you are fixing.
Trim dead roots. Cut off any brown, hollow or mushy roots with sterilised snips. Keep all the firm green/silver ones.
Repot into fresh bark. Settle long-lipped tongue orchid into the same or one-size-up pot of fresh coarse poor, sharply drained, alkaline or neutral loam with grit; low in organic matter, working bark between the roots so there are no big air gaps.
Hold off watering briefly. Mist or wait a few days before the first proper water so any cut roots seal. Then resume the normal soak-and-drain rhythm.

Aftercare

Give long-lipped tongue orchid a few days before its first proper watering so cut roots seal, then return to the weekly soak-and-drain. Keep it bright, humid and out of direct sun while new roots grip the fresh bark. It may pause growth briefly; that is expected. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for long-lipped tongue orchid

Long-lipped Tongue Orchid wants poor, sharply drained, alkaline or neutral loam with grit; low in organic matter. Naturally colonises thin, calcium-rich grassland soils on limestone or chalk. Use a very free-draining mix: two-thirds coarse grit and one-third loam (pH 7.0–8.0). Rich or peat-based composts encourage root rot and incompatible microbial communities. Mycorrhizal inoculant specific to orchids can be added on potting. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting long-lipped tongue orchid — frequently asked questions

How often should you repot long-lipped tongue orchid?

Every 1–2 years, when the bark breaks down for long-lipped tongue orchid. Repot long-lipped tongue orchid every 1–2 years — but because the bark medium has broken down and gone soggy, not because it has outgrown the pot. Do it just after flowering, into the same size or one up, using fresh poor, sharply drained, alkaline or neutral loam with grit; low in organic matter. Old, decomposed bark suffocating the roots is the real problem.

What size pot does long-lipped tongue orchid need?

When is the best time of year to repot long-lipped tongue orchid?

Why does long-lipped tongue orchid get repotted if it isn't outgrowing the pot?

Because the bark medium breaks down. Over 1–2 years the chunky bark rots into a dense, soggy, soil-like mush that suffocates the roots — that, not size, is why you repot long-lipped tongue orchid. Refresh it into fresh coarse bark just after flowering.

Should you fertilise long-lipped tongue orchid after repotting?

Not immediately. Wait about 3 weeks after repotting long-lipped tongue orchid. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.