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Fertilising guide

How to fertilise Hairy Sinningia (Sinningia villosa)— schedule & NPK

Also called Hairy Sinningia, Hairy Gloxinia.

More about hairy sinningia

About Hairy Sinningia

Sinningia villosa · also called Hairy Sinningia, Hairy Gloxinia · flowering

Sinningia villosa is a tuberous perennial from southern Brazil, distinguished by its densely hairy (villous) stems and leaves, which give the plant a soft, tactile appearance. It produces tubular scarlet to orange flowers over a long season and grows from a compact tuber, going dormant in winter. The most important care rule is to keep the tuber completely dry during its winter dormancy to prevent rot. According to ASPCA guidance on Sinningia (Gloxinia group), this genus is considered non-toxic to cats and dogs.

Growth habit: Compact tuberous perennial with an upright rosette of velvety leaves; dies back completely to the tuber each winter.

What fertiliser hairy sinningia actually wants — and why

Hairy 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 hairy 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 hairy 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 hairy sinningia:

Apply a high-potassium liquid feed every two weeks from spring until flowering ends; withhold completely during winter dormancy. 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 hairy 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 hairy sinningia

Half strength is the safe default for hairy 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 hairy sinningia first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the hairy sinningia watering schedule.

Signs you are over-feeding hairy sinningia

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for hairy sinningia:

Signs you are under-feeding hairy sinningia

If the symptoms point at watering, light or roots rather than nutrition, the full hairy sinningia care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of hairy 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 hairy 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 hairy sinningia — frequently asked questions

What fertiliser does hairy 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. Hairy 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 hairy sinningia?

Apply a high-potassium liquid feed every two weeks from spring until flowering ends; withhold completely during winter dormancy. Apply a high-potassium liquid feed every two weeks from spring until flowering ends; withhold completely during winter dormancy. 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 hairy sinningia?

Half strength is the safe default for hairy sinningia — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding hairy 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 hairy 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 hairy sinningia?

Flush the pot of hairy 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.

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