Fertilising guide
How to fertilise Kohleria digitaliflora (Kohleria digitaliflora)— schedule & NPK
Also called foxglove kohleria, digitalis-flowered kohleria.
More about kohleria digitaliflora
About Kohleria digitaliflora
Kohleria digitaliflora · also called foxglove kohleria, digitalis-flowered kohleria · flowering
Kohleria digitaliflora is a soft-stemmed, scaly-rhizomed gesneriad from Colombia grown for its foxglove-shaped, white-to-lavender blooms freckled with purple spotting. It thrives in warm, humid rooms with bright indirect light and evenly moist, peaty soil. Velvety leaves dislike cold water and direct sun. Easy from rhizomes, it rests briefly in winter before reflowering.
Growth habit: Upright to softly arching herbaceous perennial growing from scaly underground rhizomes, with velvety, toothed green leaves and tubular, spotted flowers held above the foliage.
Watch for — Leaf spotting: Cold water or droplets sitting on the velvety leaves cause pale rings and blemishes. Water at the soil line with room-temperature water and keep foliage dry.
What fertiliser kohleria digitaliflora actually wants — and why
Kohleria digitaliflora 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 kohleria digitaliflora: 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 kohleria digitaliflora, 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 kohleria digitaliflora:
Feed every 2 weeks during active growth with a balanced, dilute liquid fertiliser (quarter to half strength), or a high-phosphorus bloom feed once buds form. Stop feeding while the plant rests in winter. The pattern that matters: feed little and often through active growth and budding — every 2 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 kohleria digitaliflora 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 kohleria digitaliflora
Very dilute — quarter strength, the classic "weakly, weekly" approach for kohleria digitaliflora. 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 kohleria digitaliflora first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the kohleria digitaliflora watering schedule.
Signs you are over-feeding kohleria digitaliflora
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for kohleria digitaliflora:
- 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 kohleria digitaliflora
- 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 kohleria digitaliflora 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 kohleria digitaliflora 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 kohleria digitaliflora
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 kohleria digitaliflora — frequently asked questions
What fertiliser does kohleria digitaliflora 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. Kohleria digitaliflora 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 kohleria digitaliflora?
Feed every 2 weeks during active growth with a balanced, dilute liquid fertiliser (quarter to half strength), or a high-phosphorus bloom feed once buds form. Stop feeding while the plant rests in winter. Feed every 2 weeks during active growth with a balanced, dilute liquid fertiliser (quarter to half strength), or a high-phosphorus bloom feed once buds form. Stop feeding while the plant rests in winter. The pattern that matters: feed little and often through active growth and budding — every 2 weeks — and ease right off during the rest period that triggers the next flush.
What strength of feed for kohleria digitaliflora?
Very dilute — quarter strength, the classic "weakly, weekly" approach for kohleria digitaliflora. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
What does over-feeding kohleria digitaliflora 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 kohleria digitaliflora 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 kohleria digitaliflora?
Specialist and bloom feeds leave salts that scorch fine roots — flush kohleria digitaliflora thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Keep reading
- Kohleria digitaliflora care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water kohleria digitaliflora — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 3899 fertilising guides in the Growli library