Fertilising guide
How to fertilise Pouch Flower (Calceolaria crenatiflora)— schedule & NPK
Also called Pouch Flower, Pocketbook Plant, Slipper Flower, Lady's Purse.
More about pouch flower
About Pouch Flower
Calceolaria crenatiflora · also called Pouch Flower, Pocketbook Plant · flowering
Calceolaria crenatiflora is a cool-season annual or biennial from Chile, widely grown as a short-lived houseplant or conservatory plant for its spectacular pouched flowers in vivid shades of yellow, orange, and red, often heavily spotted with contrasting colours. It demands consistently cool temperatures (13–18 °C / 55–65 °F) and will deteriorate quickly in typical summer warmth, making it best treated as a spring-flowering gift plant to be enjoyed briefly then composted or, for the patient, raised fresh from seed each autumn. Keeping it away from radiators and draughts is the single most important care rule. The Calceolaria genus is not confirmed individually by the ASPCA; classified here as mildly-toxic as a precaution.
Growth habit: Low, spreading rosette-forming annual or biennial with softly hairy, sticky leaves and upright branching flower stems.
What fertiliser pouch flower actually wants — and why
Pouch Flower flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.
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 pouch flower: 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 pouch flower, 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 pouch flower:
Apply a high-potash liquid fertiliser every two weeks from the moment buds appear to extend the display; overfeeding with nitrogen produces leafy growth at the expense of flowers. In practice: no routine feeding at all for pouch flower — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
The dormant-season rule matters more than the exact interval: skip feeding entirely when pouch flower 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 pouch flower
None is the correct answer for pouch flower. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
Feeding always goes onto already-damp soil, never dry roots — water pouch flower first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the pouch flower watering schedule.
Signs you are over-feeding pouch flower
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for pouch flower:
- Abundant leafy growth and very few flowers (the classic over-rich symptom).
- Soft, floppy stems and a sprawling, leafy habit.
- Scorched edges and salt crust if it has been fed in a container.
Signs you are under-feeding pouch flower
- Effectively never an issue — these plants flower on poverty.
- Only on genuinely dead soil: weak, thin growth and few blooms.
- A short-lived plant in completely spent container compost.
If the symptoms point at watering, light or roots rather than nutrition, the full pouch flower care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
If pouch flower has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Organic vs synthetic feeds for pouch flower
Organic options
A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.
Synthetic / liquid feeds
None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in pouch flower.
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 pouch flower — frequently asked questions
What fertiliser does pouch flower need?
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Pouch Flower flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
How often should I feed pouch flower?
Apply a high-potash liquid fertiliser every two weeks from the moment buds appear to extend the display; overfeeding with nitrogen produces leafy growth at the expense of flowers. Apply a high-potash liquid fertiliser every two weeks from the moment buds appear to extend the display; overfeeding with nitrogen produces leafy growth at the expense of flowers. In practice: no routine feeding at all for pouch flower — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
What strength of feed for pouch flower?
None is the correct answer for pouch flower. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
What does over-feeding pouch flower look like?
Abundant leafy growth and very few flowers (the classic over-rich symptom). Soft, floppy stems and a sprawling, leafy habit. Scorched edges and salt crust if it has been fed in a container. Feeding pouch flower at all — especially "to help it flower" — is the defining mistake. Rich soil gives you a big green plant and almost no blooms; restraint is what produces the flowers.
Should I flush the soil of pouch flower?
If pouch flower has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Keep reading
- Pouch Flower care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water pouch flower — 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 strawberry fields gomphrena
- How to fertilise trailing globe amaranth
- How to fertilise strawflower
- All 10153 fertilising guides in the Growli library