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Kohleria 'Hannah Roberts' (Hannah Roberts kohleria) care

Kohleria 'Hannah Roberts'

Also called Hannah Roberts kohleria.

RHS H1bUSDA 10-11Mildly toxic to petsIndoor Generally 30-60 cm tall

Watering rhythm

5-7days

When the top 2-3 cm of mix is dry, roughly every 5-7 days in growth

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Light

Bright indirect light (just back from a sunny window)

Soil

Light, well-draining gesneriad mix

Humidity

50-60%

Temp

18-27°C

Pet safety

Mildly toxic to pets

Mature size

Generally 30-60 cm tall

Care at a glance

Light

Bright but filtered. Kohleria 'Hannah Roberts' burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright filtered light, such as a shaded south or west window, drives its heavy flowering; a grow light keeps it blooming in winter. Keep it off hot direct glass that scorches the hairy leaves, and out of deep shade that suppresses bloom. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering kohleria 'hannah roberts': when the top 2-3 cm of mix is dry, roughly every 5-7 days in growth. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water well during growth and let the surface dry slightly before the next drink; water sparingly in winter. Apply at the base or bottom-water so cold droplets never settle on the velvety leaves and cause rot.

Soil and pot

Kohleria 'Hannah Roberts' grows best in light, well-draining gesneriad mix. An African-violet mix or peat/coir lightened with perlite gives both moisture retention and aeration for its shallow surface rhizomes. Dense, water-logged compost rots the rhizomes, so prioritise drainage. 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 'Hannah Roberts' sits happiest at around 50-60% humidity and 18-27°C (65-80°F). Likes humidity at or above 50% but resents wet foliage. Boost humidity with a pebble tray or humidifier instead of misting, as moisture trapped by the hairy leaves invites spotting and botrytis. 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 'hannah roberts' sparingly. Feed every two weeks spring through autumn with a half-strength balanced or high-phosphorus liquid fertiliser to sustain its long, generous bloom, then reduce or stop in winter while the rhizomes rest in semi-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 kohleria 'hannah roberts' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Leaf spotting — Droplets resting on the fuzzy leaves leave marks and invite fungus. Water at the base or from below and avoid misting the foliage.
  • Sparse blooms — Most often too little light. Provide brighter indirect light or a grow light and feed with a high-phosphorus fertiliser to push flowers.
  • Sudden collapse to rhizomes — Usually a natural winter semi-dormancy, not loss of the plant. Keep the rhizomes barely moist and warm and growth restarts in spring.
  • Rhizome rot — Caused by soggy, compacted soil. Use an airy mix, water moderately, ensure good drainage, and cut watering right back over winter.

Propagation

Propagate readily by dividing the scaly rhizomes or by rooting stem-tip and leaf cuttings in a moist airy mix under humidity. Set rhizome sections horizontally just under the surface; new shoots emerge within a few weeks in warm conditions. 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 'Hannah Roberts' is mildly toxic to pets. Kohleria is not individually listed on the ASPCA toxic/non-toxic plant database. While it shares the Gesneriaceae family with the ASPCA-listed non-toxic African violet and goldfish plant, the genus itself is unverified, so treat it with caution and verify with a vet before regarding it as pet-safe. 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 'Hannah Roberts' care — frequently asked questions

What is the common name for Kohleria 'Hannah Roberts'?

Kohleria 'Hannah Roberts' is most commonly called Kohleria 'Hannah Roberts', but it is also known as Hannah Roberts kohleria. The names refer to the same species, so care instructions for Kohleria 'Hannah Roberts' apply identically to anything sold as Hannah Roberts kohleria.

How much light does kohleria 'hannah roberts' need?

Kohleria 'Hannah Roberts' grows best in bright indirect light (just back from a sunny window). Bright filtered light, such as a shaded south or west window, drives its heavy flowering; a grow light keeps it blooming in winter. Keep it off hot direct glass that scorches the hairy leaves, and out of deep shade that suppresses bloom.

How often should I water kohleria 'hannah roberts'?

Water kohleria 'hannah roberts' when the top 2-3 cm of mix is dry, roughly every 5-7 days in growth. Water well during growth and let the surface dry slightly before the next drink; water sparingly in winter. Apply at the base or bottom-water so cold droplets never settle on the velvety leaves and cause rot. 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 kohleria 'hannah roberts' toxic to cats and dogs?

Kohleria 'Hannah Roberts' is mildly toxic to pets. Kohleria is not individually listed on the ASPCA toxic/non-toxic plant database. While it shares the Gesneriaceae family with the ASPCA-listed non-toxic African violet and goldfish plant, the genus itself is unverified, so treat it with caution and verify with a vet before regarding it as pet-safe.

What USDA hardiness zone does kohleria 'hannah roberts' grow in?

Kohleria 'Hannah Roberts' is rated for USDA zone 10-11 (grown indoors in most US homes) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Kohleria 'Hannah Roberts' deep-dive guides

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

Featured in these plant shortlists

Kohleria 'Hannah Roberts' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Kohleria 'Hannah Roberts' is also commonly called Hannah Roberts kohleria.