Fertilising guide
How to fertilise Hairy Kohleria (Kohleria hirsuta)— schedule & NPK
Also called Hairy Kohleria, Hirsute Kohleria.
More about hairy kohleria
About Hairy Kohleria
Kohleria hirsuta · also called Hairy Kohleria, Hirsute Kohleria · houseplant
Kohleria hirsuta is a softly hairy gesneriad from South America, producing erect, velvety stems covered in dense white trichomes and pendulous, tubular red-orange flowers spotted inside. Growing from scaly rhizomes, it can be rested in winter and revived in spring. An excellent houseplant for warm rooms with bright indirect light and moderate humidity.
Growth habit: Upright, rhizomatous herbaceous perennial with soft, densely hairy stems; dies back to rhizomes in winter
What fertiliser hairy kohleria actually wants — and why
Hairy Kohleria 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 kohleria: 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 kohleria, 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 kohleria:
During active growth, feed every 2–3 weeks with a balanced liquid fertiliser (e.g. 20-20-20) at half strength. Switch to a high-potassium bloom formula when buds appear. Do not feed during 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 kohleria 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 kohleria
Half strength is the safe default for hairy kohleria — 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 kohleria first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the hairy kohleria watering schedule.
Signs you are over-feeding hairy kohleria
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for hairy kohleria:
- 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 hairy kohleria
- 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 hairy kohleria care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of hairy kohleria 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 kohleria
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 kohleria — frequently asked questions
What fertiliser does hairy kohleria 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 Kohleria 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 kohleria?
During active growth, feed every 2–3 weeks with a balanced liquid fertiliser (e.g. 20-20-20) at half strength. Switch to a high-potassium bloom formula when buds appear. Do not feed during dormancy. During active growth, feed every 2–3 weeks with a balanced liquid fertiliser (e.g. 20-20-20) at half strength. Switch to a high-potassium bloom formula when buds appear. Do not feed during 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 kohleria?
Half strength is the safe default for hairy kohleria — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding hairy kohleria 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 kohleria 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 kohleria?
Flush the pot of hairy kohleria 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
- Hairy Kohleria care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water hairy kohleria — 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 ribbon bush
- How to fertilise silver goosefoot plant
- How to fertilise red arrow arrowhead vine
- All 8452 fertilising guides in the Growli library