Repotting guide

When & how to repot Lobb's Bulbophyllum (Bulbophyllum lobbii)

Also called Lobb's Cirrhopetalum.

More about lobb's bulbophyllum

About Lobb's Bulbophyllum

Bulbophyllum lobbii · also called Lobb's Cirrhopetalum · flowering

Bulbophyllum lobbii is a widespread Southeast Asian epiphyte bearing large, solitary, nodding flowers in shades of yellow to tawny gold, often with a delicately hinged, quivering lip that moves in the breeze. A warm, humidity-loving grower, it does well mounted or in a basket with bright shade and steady moisture, and is one of the more forgiving large-flowered Bulbophyllums for beginners.

Mature size: Growths 12-20 cm tall on a spreading rhizome; individual flowers are large for the genus at roughly 6-8 cm, and the plant forms a creeping specimen across its mount over time.

Watch for — Rotting rhizome or roots: Caused by stagnant, waterlogged conditions. Grow mounted or in an open basket, provide airflow, and avoid dense, moisture-holding potting mix.

How to tell lobb's bulbophyllum needs repotting

Repotting on a calendar is less reliable than reading the plant. For lobb's bulbophyllum, 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 lobb's bulbophyllum) 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 lobb's bulbophyllum

Only every 2–4 years, when genuinely crowded. Lobb's Bulbophyllum 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 creeping epiphyte: a rhizome spaces ovoid single-leaved pseudobulbs along its length. Each flower spike carries a single large, pendulous bloom, the lip often loosely hinged so it rocks with air movement to aid pollination..

What size pot to step lobb's bulbophyllum up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Lobb's Bulbophyllum 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 lobb's bulbophyllum 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 lobb's bulbophyllum

Early spring, just as new growth restarts, is the ideal window for lobb's bulbophyllum. 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 lobb's bulbophyllum

Confirm it actually needs it. Slide lobb's bulbophyllum 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 lobb's bulbophyllum 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 cork mount or shallow basket, 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 lobb's bulbophyllum 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 lobb's bulbophyllum

Lobb's Bulbophyllum wants cork mount or shallow basket. Best mounted on cork or tree fern, or grown in a basket with live sphagnum and coarse bark that holds moisture while draining and aerating. The creeping rhizome dislikes being buried in dense, soggy mix, which rots roots and rhizome. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting lobb's bulbophyllum — frequently asked questions

How often should you repot lobb's bulbophyllum?

Only every 2–4 years, when genuinely crowded for lobb's bulbophyllum. Only repot lobb's bulbophyllum 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 cork mount or shallow basket. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does lobb's bulbophyllum need?

When is the best time of year to repot lobb's bulbophyllum?

Does lobb's bulbophyllum like to be root-bound?

Yes — lobb's bulbophyllum 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 lobb's bulbophyllum after repotting?

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