Repotting guide

When & how to repot Tiger Orchid (Grammatophyllum speciosum)

Also called Giant Orchid, Queen of Orchids.

More about tiger orchid

About Tiger Orchid

Grammatophyllum speciosum · also called Giant Orchid, Queen of Orchids · flowering

Grammatophyllum speciosum is the world's largest orchid, a massive Southeast Asian epiphyte whose clumps can weigh hundreds of kilograms and send up towering spikes of dozens of tiger-spotted, maroon-on-yellow blooms. It demands strong light, abundant warmth, water and feeding during the monsoon-like growth, then a drier rest, and is grown by serious collectors as a long-term, slow-to-flower specimen.

Mature size: Canes commonly 1.5-3 m long, with the largest recorded clumps reaching several metres across; flower spikes can stand 1.5-2.5 m tall carrying many blooms each up to about 10 cm across.

Watch for — Root and base rot: From overly fine or wet media in such a large plant. Use very coarse, fast-draining mix and a sturdy container, and respect the drier rest period.

How to tell tiger orchid needs repotting

Repotting on a calendar is less reliable than reading the plant. For tiger 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 tiger 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 tiger orchid

Every 1–2 years, when the bark breaks down. Tiger Orchid's growth habit — sympodial epiphyte forming enormous clumps of long, cane-like pseudobulbs clothed in strap leaves. mature plants send up tall, erect or arching spikes from the base bearing dozens of large, long-lasting tiger-marked flowers; clumps can become massive and very heavy. — sets the pace. Grammatophyllum speciosum is the world's largest orchid, a massive Southeast Asian epiphyte whose clumps can weigh hundreds of kilograms and send up towering spikes of dozens of tiger-spotted, maroon-on-yellow blooms. It demands strong light, abundant warmth, water and feeding during the monsoon-like growth, then a drier rest, and is grown by serious collectors as a long-term, slow-to-flower specimen.

What size pot to step tiger orchid up to

Keep tiger 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 tiger orchid

Repot tiger 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 tiger orchid

Repot after flowering. Wait until tiger 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 tiger orchid into the same or one-size-up pot of fresh coarse very coarse epiphytic mix in a large container, 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 tiger 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 tiger orchid

Tiger Orchid wants very coarse epiphytic mix in a large container. Use big chunks of bark, charcoal, and coarse drainage material in a large, sturdy, free-draining pot or basket able to anchor the heavy plant. The thick roots need air and rapid drainage; fine, water-retentive mixes rot this giant epiphyte. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tiger orchid — frequently asked questions

How often should you repot tiger orchid?

Every 1–2 years, when the bark breaks down for tiger orchid. Repot tiger 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 very coarse epiphytic mix in a large container. Old, decomposed bark suffocating the roots is the real problem.

What size pot does tiger orchid need?

When is the best time of year to repot tiger orchid?

Why does tiger 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 tiger orchid. Refresh it into fresh coarse bark just after flowering.

Should you fertilise tiger orchid after repotting?

Not immediately. Wait about 3 weeks after repotting tiger 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.