Repotting guide

When & how to repot Tiger Crow Orchid (Oncidium tigrinum)

Also called Tiger Oncidium.

More about tiger crow orchid

About Tiger Crow Orchid

Oncidium tigrinum · also called Tiger Oncidium · flowering

Oncidium tigrinum is a cool-growing Mexican orchid prized for fragrant, chestnut-and-yellow tiger-barred flowers on tall sprays in autumn. It grows from plump pseudobulbs, wants bright indirect light, a chunky bark mix that dries between waterings, and a winter rest. Reliable and showy, it rewards a cooler windowsill better than warm rooms.

Mature size: Pseudobulbs 8-12 cm tall; flower spikes reach 60-90 cm with many 5-6 cm fragrant blooms.

Watch for — Black, mushy pseudobulbs: Bacterial or fungal rot from a soggy, broken-down mix. Cut out affected tissue with a sterile blade, repot into fresh bark, and improve airflow and drainage.

How to tell tiger crow orchid needs repotting

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

Every 1–2 years, when the bark breaks down. Tiger Crow Orchid's growth habit — sympodial epiphyte forming a cluster of clustered, flattened green pseudobulbs, each topped with one or two strappy leaves, sending up tall branched flower spikes from the base. — sets the pace. Oncidium tigrinum is a cool-growing Mexican orchid prized for fragrant, chestnut-and-yellow tiger-barred flowers on tall sprays in autumn. It grows from plump pseudobulbs, wants bright indirect light, a chunky bark mix that dries between waterings, and a winter rest. Reliable and showy, it rewards a cooler windowsill better than warm rooms.

What size pot to step tiger crow orchid up to

Keep tiger crow 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 crow orchid

Repot tiger crow 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 crow orchid

Repot after flowering. Wait until tiger crow 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 crow orchid into the same or one-size-up pot of fresh coarse open epiphytic orchid bark mix, 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 crow 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 crow orchid

Tiger Crow Orchid wants open epiphytic orchid bark mix. Medium-grade fir bark with perlite, charcoal and a little sphagnum, in a pot with copious drainage. Fast-draining and airy; it resents sitting wet and rots if the mix breaks down, so repot every 2 years. 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 crow orchid — frequently asked questions

How often should you repot tiger crow orchid?

Every 1–2 years, when the bark breaks down for tiger crow orchid. Repot tiger crow 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 open epiphytic orchid bark mix. Old, decomposed bark suffocating the roots is the real problem.

What size pot does tiger crow orchid need?

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

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

Should you fertilise tiger crow orchid after repotting?

Not immediately. Wait about 3 weeks after repotting tiger crow 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.