Repotting guide

When & how to repot Brassia caudata (Brassia caudata)

Also called Long-tailed Spider Orchid.

More about brassia caudata

About Brassia caudata

Brassia caudata · also called Long-tailed Spider Orchid · flowering

Brassia caudata, the long-tailed spider orchid, produces dramatic blooms with long, slender, spider-like sepals barred in green-yellow and brown. A warm- to intermediate-growing epiphyte from the Americas and the Caribbean, it likes bright light, a wet-then-slightly-dry watering rhythm and a definite drier rest, making it more drought-tolerant than the cool-growing pansy orchids.

Mature size: Around 30-45 cm tall, with arching inflorescences and flowers whose tails can span 15-25 cm or more.

Watch for — Leaf and bud spotting: Fungal or bacterial spots appear when foliage stays wet without air movement. Water in the morning and keep air circulating around the plant.

How to tell brassia caudata needs repotting

Repotting on a calendar is less reliable than reading the plant. For brassia caudata, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for brassia caudata) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 brassia caudata

Only every 2–4 years, when genuinely crowded. Brassia caudata is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Sympodial epiphyte with a creeping rhizome, flattened oval pseudobulbs each bearing one to three strap-shaped leaves, and arching sprays of long-tailed spider-like flowers..

What size pot to step brassia caudata up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Brassia caudata positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping brassia caudata into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 brassia caudata

Early spring, just as new growth restarts, is the ideal window for brassia caudata. 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 brassia caudata

Confirm it actually needs it. Slide brassia caudata out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip brassia caudata out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh medium-grade bark epiphyte mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water brassia caudata again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for brassia caudata

Brassia caudata wants medium-grade bark epiphyte mix. A medium fir-bark blend with charcoal and perlite gives the fast drainage and airflow its thick roots want. It also grows superbly mounted on cork or in a basket for its rambling rhizome. Repot every 2-3 years in spring as the mix breaks down. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting brassia caudata — frequently asked questions

How often should you repot brassia caudata?

Only every 2–4 years, when genuinely crowded for brassia caudata. Only repot brassia caudata every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using medium-grade bark epiphyte mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does brassia caudata need?

When is the best time of year to repot brassia caudata?

Does brassia caudata like to be root-bound?

Yes — brassia caudata genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise brassia caudata after repotting?

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