Fertilising guide

How to fertilise Anthurium andraeanum 'Black Beauty' (Anthurium andraeanum 'Black Beauty')— schedule & NPK

Also called black anthurium, dark anthurium.

More about anthurium andraeanum 'black beauty'

About Anthurium andraeanum 'Black Beauty'

Anthurium andraeanum 'Black Beauty' · also called black anthurium, dark anthurium · tropical

Anthurium andraeanum 'Black Beauty' is a dramatic flamingo flower whose spathes open deep burgundy and darken to near-black, with a contrasting pale-to-dark spadix. The dark pigment shows best in bright indirect light. Like all andraeanum hybrids it flowers much of the year indoors when given warmth, high humidity and a chunky, fast-draining aroid mix.

Growth habit: Evergreen, clump-forming epiphytic perennial with an upright rosette of glossy heart-shaped leaves and dark burgundy-to-black spathes on tall stalks.

Watch for — Brown leaf tips: Low humidity or hard-water salts; raise humidity and use filtered or rainwater, flushing the pot occasionally.

What fertiliser anthurium andraeanum 'black beauty' actually wants — and why

Anthurium andraeanum 'Black Beauty' 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 anthurium andraeanum 'black beauty': 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 anthurium andraeanum 'black beauty', 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 anthurium andraeanum 'black beauty':

Feed every 4-6 weeks during spring and summer with a half-strength balanced fertiliser, or a high-phosphorus bloom feed to sustain spathes. Reduce or stop feeding in winter and flush the soil now and then to prevent salt build-up. The pattern that matters: feed little and often through active growth and budding — every 4-6 weeks — 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 anthurium andraeanum 'black beauty' 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 anthurium andraeanum 'black beauty'

Very dilute — quarter strength, the classic "weakly, weekly" approach for anthurium andraeanum 'black beauty'. 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 anthurium andraeanum 'black beauty' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the anthurium andraeanum 'black beauty' watering schedule.

Signs you are over-feeding anthurium andraeanum 'black beauty'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for anthurium andraeanum 'black beauty':

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 anthurium andraeanum 'black beauty'

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 anthurium andraeanum 'black beauty' 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 anthurium andraeanum 'black beauty' 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 anthurium andraeanum 'black beauty'

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 anthurium andraeanum 'black beauty' — frequently asked questions

What fertiliser does anthurium andraeanum 'black beauty' 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. Anthurium andraeanum 'Black Beauty' 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 anthurium andraeanum 'black beauty'?

Feed every 4-6 weeks during spring and summer with a half-strength balanced fertiliser, or a high-phosphorus bloom feed to sustain spathes. Reduce or stop feeding in winter and flush the soil now and then to prevent salt build-up. Feed every 4-6 weeks during spring and summer with a half-strength balanced fertiliser, or a high-phosphorus bloom feed to sustain spathes. Reduce or stop feeding in winter and flush the soil now and then to prevent salt build-up. The pattern that matters: feed little and often through active growth and budding — every 4-6 weeks — and ease right off during the rest period that triggers the next flush.

What strength of feed for anthurium andraeanum 'black beauty'?

What does over-feeding anthurium andraeanum 'black beauty' 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 anthurium andraeanum 'black beauty' 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 anthurium andraeanum 'black beauty'?