Fertilising guide
How to fertilise Hoya Krimson Princess (Hoya carnosa 'Krimson Princess')— schedule & NPK
Also called Krimson Princess wax plant, Hoya carnosa 'Rubra', variegated wax plant, porcelain flower.
More about hoya krimson princess
About Hoya Krimson Princess
Hoya carnosa 'Krimson Princess' · also called Krimson Princess wax plant, Hoya carnosa 'Rubra' · houseplant
Hoya Krimson Princess is a trailing wax-plant cultivar prized for waxy leaves with creamy-pink inner variegation and clusters of fragrant, star-shaped flowers. Give it bright indirect light, let the soil dry almost fully between waterings, and warmth above 10C. The ASPCA lists Hoya carnosa as non-toxic to cats and dogs.
Growth habit: Evergreen, semi-succulent epiphytic vine with trailing or climbing stems and thick, waxy variegated leaves. Mature plants produce perennial flowering spurs (peduncles) that bear clusters of fragrant, star-shaped pink-and-red blooms.
What fertiliser hoya krimson princess actually wants — and why
Hoya Krimson Princess 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.
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.
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 hoya krimson princess: 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 hoya krimson princess, 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 hoya krimson princess:
Feed monthly during spring and summer with a balanced, diluted (half-strength) liquid houseplant fertiliser. A higher-phosphorus bloom feed can encourage flowering. Stop feeding in autumn and winter when growth slows. The pattern that matters: feed little and often through active growth and budding — monthly — 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 hoya krimson princess 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 hoya krimson princess
Very dilute — quarter strength, the classic "weakly, weekly" approach for hoya krimson princess. 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 hoya krimson princess first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the hoya krimson princess watering schedule.
Signs you are over-feeding hoya krimson princess
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for hoya krimson princess:
- 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 hoya krimson princess
- 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 hoya krimson princess 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 hoya krimson princess 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 hoya krimson princess
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 hoya krimson princess — frequently asked questions
What fertiliser does hoya krimson princess 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. Hoya Krimson Princess 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 hoya krimson princess?
Feed monthly during spring and summer with a balanced, diluted (half-strength) liquid houseplant fertiliser. A higher-phosphorus bloom feed can encourage flowering. Stop feeding in autumn and winter when growth slows. Feed monthly during spring and summer with a balanced, diluted (half-strength) liquid houseplant fertiliser. A higher-phosphorus bloom feed can encourage flowering. Stop feeding in autumn and winter when growth slows. The pattern that matters: feed little and often through active growth and budding — monthly — and ease right off during the rest period that triggers the next flush.
What strength of feed for hoya krimson princess?
Very dilute — quarter strength, the classic "weakly, weekly" approach for hoya krimson princess. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
What does over-feeding hoya krimson princess 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 hoya krimson princess 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 hoya krimson princess?
Specialist and bloom feeds leave salts that scorch fine roots — flush hoya krimson princess thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Keep reading
- Hoya Krimson Princess care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water hoya krimson princess — 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 snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 389 fertilising guides in the Growli library