Fertilising guide

How to fertilise Bulbophyllum falcatum (Bulbophyllum falcatum)— schedule & NPK

Also called Sickle-leaf Bulbophyllum.

More about bulbophyllum falcatum

About Bulbophyllum falcatum

Bulbophyllum falcatum · also called Sickle-leaf Bulbophyllum · flowering

Bulbophyllum falcatum is an African epiphytic orchid named for its flattened, sickle-shaped flower rachis that bears two ranks of tiny green-to-maroon blooms. Pseudobulbs sit along a creeping rhizome and carry a single leathery leaf. It grows best mounted or in an open basket with year-round warmth, humidity and bright, filtered light.

Growth habit: Creeping epiphytic orchid; pseudobulbs spaced along a horizontal rhizome, each topped with one leathery leaf, with distinctive flattened sickle-shaped flower spikes.

What fertiliser bulbophyllum falcatum actually wants — and why

Bulbophyllum falcatum is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for bulbophyllum falcatum: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed bulbophyllum falcatum, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For bulbophyllum falcatum:

Apply a quarter- to half-strength balanced orchid fertiliser weekly to fortnightly during active growth ('weakly, weekly'), tapering off in the cooler months. Flush the mount or medium with plain water periodically to clear salts. The pattern that matters: feed little and often through active growth and budding — weekly — and ease right off during the rest period that triggers the next flush.

The dormant-season rule matters more than the exact interval: skip feeding entirely when bulbophyllum falcatum is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for bulbophyllum falcatum

Very dilute — quarter strength, the classic "weakly, weekly" approach for bulbophyllum falcatum. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.

Feeding always goes onto already-damp soil, never dry roots — water bulbophyllum falcatum first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bulbophyllum falcatum watering schedule.

Signs you are over-feeding bulbophyllum falcatum

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bulbophyllum falcatum:

Lush green leaves but few or no flowers (too much nitrogen).
Brown, scorched leaf tips and edges — a classic fine-root burn.
White salt crust on the medium or pot, and stalled buds.
Bud blast: buds forming then shrivelling and dropping.

Signs you are under-feeding bulbophyllum falcatum

Sparse or no flowering despite good light and the right season.
Smaller, paler new leaves and a generally weak, tired plant.
Flowers that are smaller or fade faster than they should.

If the symptoms point at watering, light or roots rather than nutrition, the full bulbophyllum falcatum care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Specialist and bloom feeds leave salts that scorch fine roots — flush bulbophyllum falcatum thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.

Organic vs synthetic feeds for bulbophyllum falcatum

Organic options

Gentler options exist: a dilute seaweed feed (mildly potassium-rich) or worm-casting tea. UK: Westland seaweed, or a dilute tomato feed like Tomorite for bud-formers; US: Espoma Orchid! / Violet! or Neptune's Harvest. Lower burn risk, slower response.

Synthetic / liquid feeds

A species-matched bloom feed at quarter strength — UK: Baby Bio Orchid / African Violet food, or a high-potash Tomorite/Phostrogen for budding bloomers; US: Miracle-Gro Orchid or Bloom Booster, Schultz African Violet.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising bulbophyllum falcatum — frequently asked questions

What fertiliser does bulbophyllum falcatum need?

A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers. Bulbophyllum falcatum is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

How often should I feed bulbophyllum falcatum?

Apply a quarter- to half-strength balanced orchid fertiliser weekly to fortnightly during active growth ('weakly, weekly'), tapering off in the cooler months. Flush the mount or medium with plain water periodically to clear salts. Apply a quarter- to half-strength balanced orchid fertiliser weekly to fortnightly during active growth ('weakly, weekly'), tapering off in the cooler months. Flush the mount or medium with plain water periodically to clear salts. The pattern that matters: feed little and often through active growth and budding — weekly — and ease right off during the rest period that triggers the next flush.

What strength of feed for bulbophyllum falcatum?

What does over-feeding bulbophyllum falcatum look like?

Lush green leaves but few or no flowers (too much nitrogen). Brown, scorched leaf tips and edges — a classic fine-root burn. White salt crust on the medium or pot, and stalled buds. Bud blast: buds forming then shrivelling and dropping. Using an ordinary high-nitrogen houseplant feed on bulbophyllum falcatum is the headline mistake — you get a healthy-looking plant that simply refuses to bloom. The second is feeding through the rest period and breaking the dormancy cue it needs to set buds.

Should I flush the soil of bulbophyllum falcatum?