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Fertilising guide

How to fertilise Selenicereus anthonyanus (Selenicereus anthonyanus)— schedule & NPK

Also called Rick Rack Cactus, Fishbone Orchid Cactus.

More about selenicereus anthonyanus

About Selenicereus anthonyanus

Selenicereus anthonyanus · also called Rick Rack Cactus, Fishbone Orchid Cactus · houseplant

An easy, fast-growing epiphytic cactus from southern Mexico, instantly recognised by flat, deeply zigzagged stems that resemble a fishbone or rickrack ribbon. Grown mainly as a trailing foliage plant, it occasionally rewards mature, well-rested specimens with large, fragrant nocturnal flowers that last a single night. It is happiest cascading from a hanging basket.

Growth habit: Trailing and scrambling epiphyte with flat, succulent, deeply lobed zigzag stems that cascade or climb via aerial roots; ideal in a hanging basket.

Watch for — Reddening or bleaching: Stems flush red or turn pale in too much direct sun. Some blush is normal stress colour, but move it to brighter indirect light if it looks washed out.

What fertiliser selenicereus anthonyanus actually wants — and why

Selenicereus anthonyanus 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 selenicereus anthonyanus: 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 selenicereus anthonyanus, 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 selenicereus anthonyanus:

Feed every two to four weeks in spring and summer with a balanced houseplant feed at half strength, switching to a higher-potassium feed to encourage blooming. Pause feeding over winter. Treat that as sparingly through the growing season 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 selenicereus anthonyanus 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 selenicereus anthonyanus

Half strength is the safe default for selenicereus anthonyanus — 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 selenicereus anthonyanus first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the selenicereus anthonyanus watering schedule.

Signs you are over-feeding selenicereus anthonyanus

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

Signs you are under-feeding selenicereus anthonyanus

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

Flushing and leaching the salts

Flush the pot of selenicereus anthonyanus 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 selenicereus anthonyanus

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 selenicereus anthonyanus — frequently asked questions

What fertiliser does selenicereus anthonyanus 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. Selenicereus anthonyanus 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 selenicereus anthonyanus?

Feed every two to four weeks in spring and summer with a balanced houseplant feed at half strength, switching to a higher-potassium feed to encourage blooming. Pause feeding over winter. Feed every two to four weeks in spring and summer with a balanced houseplant feed at half strength, switching to a higher-potassium feed to encourage blooming. Pause feeding over winter. Treat that as sparingly through the growing season 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 selenicereus anthonyanus?

Half strength is the safe default for selenicereus anthonyanus — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding selenicereus anthonyanus 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 selenicereus anthonyanus 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 selenicereus anthonyanus?

Flush the pot of selenicereus anthonyanus 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.

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