Fertilising guide
How to fertilise Sinningia concinna (Sinningia concinna)— schedule & NPK
Also called concinna sinningia, miniature gloxinia.
More about sinningia concinna
About Sinningia concinna
Sinningia concinna · also called concinna sinningia, miniature gloxinia · flowering
Sinningia concinna is a tiny tuberous gesneriad from Brazil, one of the smallest in the genus, with rosettes of small hairy leaves and outsized purple-and-white tubular flowers. A parent of many micro-miniature hybrids, it thrives in warm, humid, bright-indirect conditions and is ideal for terrariums. The ASPCA lists Sinningia (gloxinia) as non-toxic to pets.
Growth habit: Micro-miniature tuberous perennial forming a low rosette of small hairy leaves a few centimetres across, with large flowers relative to the plant; may go dormant from a small tuber.
What fertiliser sinningia concinna actually wants — and why
Sinningia concinna is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.
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 sinningia concinna: 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 sinningia concinna, 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 sinningia concinna:
Feed every 2-3 weeks during active growth with a quarter- to half-strength balanced or high-potash feed; this micro-miniature is sensitive to fertiliser salts, so keep it dilute. Stop feeding once the plant goes dormant. For a hungry bloomer that means feeding regularly — every 2-3 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
The dormant-season rule matters more than the exact interval: skip feeding entirely when sinningia concinna 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 sinningia concinna
Follow the flowering-feed label rate for sinningia concinna, or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
Feeding always goes onto already-damp soil, never dry roots — water sinningia concinna first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the sinningia concinna watering schedule.
Signs you are over-feeding sinningia concinna
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for sinningia concinna:
- Lots of lush leaves but few flowers (too much nitrogen).
- Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
- Soft, sappy growth prone to aphids and mildew.
Signs you are under-feeding sinningia concinna
- Sparse, small, short-lived flowers and pale foliage.
- A tired plant that stops blooming early in the season.
- Weak growth and poor repeat-flowering after the first flush.
If the symptoms point at watering, light or roots rather than nutrition, the full sinningia concinna care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown sinningia concinna accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Organic vs synthetic feeds for sinningia concinna
Organic options
A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.
Synthetic / liquid feeds
A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.
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 sinningia concinna — frequently asked questions
What fertiliser does sinningia concinna need?
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Sinningia concinna is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
How often should I feed sinningia concinna?
Feed every 2-3 weeks during active growth with a quarter- to half-strength balanced or high-potash feed; this micro-miniature is sensitive to fertiliser salts, so keep it dilute. Stop feeding once the plant goes dormant. Feed every 2-3 weeks during active growth with a quarter- to half-strength balanced or high-potash feed; this micro-miniature is sensitive to fertiliser salts, so keep it dilute. Stop feeding once the plant goes dormant. For a hungry bloomer that means feeding regularly — every 2-3 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for sinningia concinna?
Follow the flowering-feed label rate for sinningia concinna, or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
What does over-feeding sinningia concinna look like?
Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on sinningia concinna is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.
Should I flush the soil of sinningia concinna?
Container-grown sinningia concinna accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Keep reading
- Sinningia concinna care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water sinningia concinna — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 3899 fertilising guides in the Growli library