Fertilising guide
How to fertilise Large-flower Bulbophyllum (Bulbophyllum macranthum)— schedule & NPK
Also called Large-flowered Cirrhopetalum.
More about large-flower bulbophyllum
About Large-flower Bulbophyllum
Bulbophyllum macranthum · also called Large-flowered Cirrhopetalum · tropical
Bulbophyllum macranthum is a warm-growing epiphytic orchid native to Southeast Asia and parts of the Pacific, producing large solitary flowers with long, thread-like lateral sepal tails. It features a creeping rhizome and conical pseudobulbs. Individually listed as non-toxic by the ASPCA. A fascinating specimen for warm-orchid growers.
Growth habit: Creeping rhizomatous epiphyte with conical pseudobulbs
What fertiliser large-flower bulbophyllum actually wants — and why
Large-flower Bulbophyllum is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 large-flower bulbophyllum: 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 large-flower bulbophyllum, 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 large-flower bulbophyllum:
Feed with a balanced orchid fertiliser at half to full label strength every two weeks in spring and summer. Taper to monthly in autumn and winter. A high-potassium feed in late summer can encourage blooming. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when large-flower bulbophyllum 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 large-flower bulbophyllum
Half strength is the safe default for large-flower bulbophyllum — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water large-flower bulbophyllum first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the large-flower bulbophyllum watering schedule.
Signs you are over-feeding large-flower bulbophyllum
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for large-flower bulbophyllum:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding large-flower bulbophyllum
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full large-flower bulbophyllum care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of large-flower bulbophyllum with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for large-flower bulbophyllum
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 large-flower bulbophyllum — frequently asked questions
What fertiliser does large-flower bulbophyllum need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Large-flower Bulbophyllum is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed large-flower bulbophyllum?
Feed with a balanced orchid fertiliser at half to full label strength every two weeks in spring and summer. Taper to monthly in autumn and winter. A high-potassium feed in late summer can encourage blooming. Feed with a balanced orchid fertiliser at half to full label strength every two weeks in spring and summer. Taper to monthly in autumn and winter. A high-potassium feed in late summer can encourage blooming. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for large-flower bulbophyllum?
Half strength is the safe default for large-flower bulbophyllum — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding large-flower bulbophyllum look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding large-flower bulbophyllum year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of large-flower bulbophyllum?
Flush the pot of large-flower bulbophyllum with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Large-flower Bulbophyllum care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water large-flower bulbophyllum — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise rayed prosthechea
- How to fertilise prism-fruit prosthechea
- How to fertilise tiger trichocentrum
- All 11687 fertilising guides in the Growli library