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Plant care

Hairy Kohleria (Hirsute Kohleria) care

Kohleria hirsuta

Also called Hairy Kohleria, Hirsute Kohleria.

RHS H1bUSDA 10–12Pet-safeIndoor 30–60 cm tall

Watering rhythm

7-10days

Every 7–10 days during growth; minimal in dormancy

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Light

Bright indirect light (just back from a sunny window)

Soil

Humus-rich, free-draining mix

Humidity

50–70%

Temp

18–26°C

Pet safety

Pet-safe

Mature size

30–60 cm tall

Care at a glance

Light

Hairy Kohleria is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Performs best in bright, indirect light. An east- or west-facing windowsill or a spot back from a south-facing window is ideal. Insufficient light causes leggy stems and reluctant flowering. Supplemental grow-lights work well in lower-light homes. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water hairy kohleria every 7–10 days during growth; minimal in dormancy. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Keep evenly moist during the growing season, allowing the top centimetre of soil to dry between waterings. Avoid wetting the hairy stems and leaves. As growth slows in autumn, reduce watering; allow near-dry conditions during winter rhizome dormancy.

Soil and pot

Hairy Kohleria grows best in humus-rich, free-draining mix. Use a mix of 2 parts peat-free multipurpose compost, 1 part perlite, and 1 part fine bark. Good aeration is essential to prevent rhizome rot. A slightly acidic pH of 6.0–6.5 suits this species well. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Hairy Kohleria sits happiest at around 50–70% humidity and 18–26°C (64–79°F). Moderate to high humidity is preferred. A pebble tray with water or a nearby humidifier maintains appropriate levels. Avoid misting the densely hairy foliage and stems directly, as trapped moisture promotes fungal issues. If you keep the room above 18–26°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed hairy kohleria sparingly. 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. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on hairy kohleria in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Rhizome rot — Overwatering during the growing season or keeping rhizomes too wet during dormancy causes rot. Let the soil dry more between waterings and store dormant rhizomes in slightly moist (not wet) perlite or compost over winter.
  • Leggy, weak growth — Insufficient light causes Kohleria to stretch toward the light source, producing weak stems and few flowers. Move to a brighter position or add grow-lights. Pinching tips early in the season promotes bushy growth.
  • Thrips — Thrips can damage flowers and leave silvery streaks on hairy foliage. Inspect new growth and flowers regularly. Treat with spinosad or insecticidal soap, repeating applications weekly for three to four weeks to break the pest cycle.

Propagation

Divide rhizomes at repotting in spring, ensuring each section has at least one growth bud. Stem-tip cuttings (8–10 cm) root easily in moist perlite or coir at 20–22°C under high humidity. Leaf cuttings with petioles also produce plantlets. Seed germinates at 22–24°C on moist, fine compost. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Hairy Kohleria is pet-safe. Kohleria belongs to Gesneriaceae, a plant family not listed as toxic by ASPCA. No toxic compounds have been documented for Kohleria hirsuta. The species is regarded as pet-safe, though ingestion of significant amounts of hairy plant material could cause mild mouth or stomach irritation due to the trichomes. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Hairy Kohleria care — frequently asked questions

What is the common name for Kohleria hirsuta?

Kohleria hirsuta is most commonly called Hairy Kohleria, but it is also known as Hairy Kohleria, Hirsute Kohleria. The names refer to the same species, so care instructions for Hairy Kohleria apply identically to anything sold as Hirsute Kohleria.

How much light does hairy kohleria need?

Hairy Kohleria grows best in bright indirect light (just back from a sunny window). Performs best in bright, indirect light. An east- or west-facing windowsill or a spot back from a south-facing window is ideal. Insufficient light causes leggy stems and reluctant flowering. Supplemental grow-lights work well in lower-light homes.

How often should I water hairy kohleria?

Water hairy kohleria every 7–10 days during growth; minimal in dormancy. Keep evenly moist during the growing season, allowing the top centimetre of soil to dry between waterings. Avoid wetting the hairy stems and leaves. As growth slows in autumn, reduce watering; allow near-dry conditions during winter rhizome dormancy. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is hairy kohleria toxic to cats and dogs?

Hairy Kohleria is pet-safe. Kohleria belongs to Gesneriaceae, a plant family not listed as toxic by ASPCA. No toxic compounds have been documented for Kohleria hirsuta. The species is regarded as pet-safe, though ingestion of significant amounts of hairy plant material could cause mild mouth or stomach irritation due to the trichomes.

What USDA hardiness zone does hairy kohleria grow in?

Hairy Kohleria is rated for USDA zone 10–12 and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Hairy Kohleria deep-dive guides

Every aspect of hairy kohleria care, each with its own calibrated guide:

Featured in these plant shortlists

Hairy Kohleria qualifies for 6 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Hairy Kohleria is also commonly called Hairy Kohleria or Hirsute Kohleria.