Repotting guide

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

Also called Lobb's Orchid, Yellow Bulbophyllum.

More about lobb's bulbophyllum

About Lobb's Bulbophyllum

Bulbophyllum lobbii · also called Lobb's Orchid, Yellow Bulbophyllum · tropical

A variable Southeast Asian epiphyte bearing solitary, large, creamy-yellow flowers with finely spotted petals and a movable lip that rocks in the slightest breeze. Collected by Thomas Lobb in the 1840s, it remains a collector favourite. ASPCA lists Bulbophyllum as non-toxic. Grows well in warm, humid, bright conditions.

Mature size: Pseudobulbs 4-8 cm; flower spike 15-25 cm bearing a single large bloom per spike

Watch for — Root desiccation on mounts: Mounted specimens dry out quickly in low humidity or heated rooms; increase misting frequency or move to a more humid microclimate.

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 poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new lobb's bulbophyllum leaves are noticeably smaller than older ones despite good light.

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

Every 12–18 months — sooner if roots show fast. Lobb's Bulbophyllum's growth habit — creeping sympodial epiphyte with well-spaced ovoid pseudobulbs on a rhizome; single leathery leaf per pseudobulb — sets the pace. A variable Southeast Asian epiphyte bearing solitary, large, creamy-yellow flowers with finely spotted petals and a movable lip that rocks in the slightest breeze. Collected by Thomas Lobb in the 1840s, it remains a collector favourite. ASPCA lists Bulbophyllum as non-toxic. Grows well in warm, humid, bright conditions.

What size pot to step lobb's bulbophyllum up to

Step up one pot size — about 2–3 cm (an inch) wider. Lobb's Bulbophyllum grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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

Time it for spring. Repot lobb's bulbophyllum in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip lobb's bulbophyllum out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh mounted on cork bark or tree-fern slab, or in very coarse bark in a basket in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water lobb's bulbophyllum once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. 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 mounted on cork bark or tree-fern slab, or in very coarse bark in a basket. Mounting on cork bark or tree fern is preferred, allowing aerial root development and excellent drainage. If potted, use only the coarsest bark chunks in a slatted wooden basket; dense potting mixes cause rapid root rot. 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?

Every 12–18 months — sooner if roots show fast for lobb's bulbophyllum. Repot lobb's bulbophyllum roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh mounted on cork bark or tree-fern slab, or in very coarse bark in a basket. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does lobb's bulbophyllum need?

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

Can you put lobb's bulbophyllum straight into a much bigger pot?

No. Even a fast-growing lobb's bulbophyllum should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

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.