Kohleria (tree gloxinia) care

Light

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. Bright, indirect light gives the best flowering and compact growth; an east window or filtered light is ideal. Direct sun scorches the soft leaves, while too little light causes leggy stems and few blooms. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water kohleria when the top 2-3 cm of soil is dry, every 5-7 days in growth. 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 active growth using tepid water, letting the surface dry slightly between waterings. As stems die back into dormancy, withhold water and keep the rhizomes barely moist until new growth appears.

Soil and pot

Kohleria grows best in light, well-drained, humus-rich mix. A loose, free-draining medium such as an African violet or peat-free houseplant mix with added perlite. Good drainage protects the rhizomes from rot during the dormant rest period. 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

Kohleria sits happiest at around 50-70% humidity and 18-27°C (64-81°F). Prefers moderate to high humidity; dry air browns leaf edges and reduces flowering. Use a pebble tray or grouping rather than direct misting, since water sitting on the hairy foliage can mark or spot it. If you keep the room above 18 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 kohleria sparingly. Feed every 2 weeks through the growing season with a balanced or high-potassium fertiliser at half strength, or an African violet feed, to sustain heavy flowering. Stop feeding as the plant enters dormancy and resume when new shoots emerge. 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 kohleria in the Growli community. Each is annotated with the most common cause so you know where to start.

• Stems dying back — Usually natural dormancy rather than a problem. Reduce watering, keep the rhizomes cool and barely moist, and growth restarts within weeks to a couple of months.
• Leaf spotting and marks — Cold water or droplets sitting on the hairy leaves cause pale or brown blotches. Water at the soil with tepid water and avoid wetting the foliage.
• Leggy growth, few flowers — A sign of insufficient light. Move to a brighter spot with bright indirect light and pinch stem tips to encourage bushier, more floriferous growth.
• Spider mites and mealybugs — Favoured by dry air; check leaf undersides and joints. Raise humidity, isolate the plant, and treat with insecticidal soap or dab mealybugs with diluted alcohol.

Propagation

Very easy: divide the scaly rhizomes during dormancy, or take stem-tip cuttings in spring and summer that root readily in a moist, warm mix. Individual rhizome scales and even leaf cuttings can also be grown on like other gesneriads. 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

Kohleria is mildly toxic to pets. Kohleria is not individually listed on the ASPCA Toxic/Non-Toxic Plants database. Although it belongs to the gesneriad family (Gesneriaceae) alongside the ASPCA-confirmed non-toxic African violet, the genus itself is not specifically evaluated. Treat with caution as mildly toxic, keep pets from chewing it, and verify with a vet if ingestion occurs. 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.

Kohleria deep-dive guides

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

• Kohleria watering schedule
• Kohleria light requirements
• Best soil mix for kohleria
• Kohleria fertilizing guide
• When to repot kohleria
• How to propagate kohleria
• Kohleria growth rate & size
• Kohleria cold hardiness
• Kohleria temperature & humidity
• Is kohleria toxic to cats & dogs?
• Is kohleria toxic to cats?
• Is kohleria toxic to dogs?
• Getting kohleria to bloom

Featured in these plant shortlists

Kohleria qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best trailing & climbing houseplants — Vining and trailing houseplants for shelves, hanging pots, and moss poles — selected by growth habit.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Kohleria is also known as tree gloxinia, Kohleria, and kohleria.

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