Fertilising guide
How to fertilise Lined Sinningia (Sinningia lineata)— schedule & NPK
Also called Lined Sinningia, Streaked Sinningia.
More about lined sinningia
About Lined Sinningia
Sinningia lineata · also called Lined Sinningia, Streaked Sinningia · flowering
Sinningia lineata is a bold tuberous gesneriad from Brazil with a striking caudiciform base — a large, exposed above-ground tuber that can become very impressive with age. The plant produces just a few pairs of large, near-circular leaves and bears red tubular flowers, often rewarding growers with a second flush if stems are cut back after the first bloom. It is widely grown by gesneriad enthusiasts and caudiciform collectors alike. The ASPCA lists the Sinningia genus as non-toxic to cats and dogs; this species is not individually verified.
Growth habit: Tuberous caudiciform perennial with a large, above-ground caudex; produces few but very large, near-circular leaf pairs.
What fertiliser lined sinningia actually wants — and why
Lined Sinningia 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 lined sinningia: 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 lined sinningia, 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 lined sinningia:
Feed with a half-strength balanced liquid fertiliser every two weeks throughout the growing and flowering season; withhold from dormancy until new growth begins. 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 lined sinningia 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 lined sinningia
Half strength is the safe default for lined sinningia — 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 lined sinningia first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the lined sinningia watering schedule.
Signs you are over-feeding lined sinningia
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for lined sinningia:
- 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.
Signs you are under-feeding lined sinningia
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full lined sinningia care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of lined sinningia 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 lined sinningia
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 lined sinningia — frequently asked questions
What fertiliser does lined sinningia 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. Lined Sinningia 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 lined sinningia?
Feed with a half-strength balanced liquid fertiliser every two weeks throughout the growing and flowering season; withhold from dormancy until new growth begins. Feed with a half-strength balanced liquid fertiliser every two weeks throughout the growing and flowering season; withhold from dormancy until new growth begins. 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 lined sinningia?
Half strength is the safe default for lined sinningia — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding lined sinningia 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 lined sinningia 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 lined sinningia?
Flush the pot of lined sinningia 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.
Keep reading
- Lined Sinningia care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water lined sinningia — 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 lysimachia nummularia 'aurea'
- How to fertilise mimulus ringens
- How to fertilise primula farinosa
- All 10153 fertilising guides in the Growli library