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Plant care

Spiked Kohleria (Spike-Flowered Kohleria) care

Kohleria spicata

Also called Spiked Kohleria, Spike-Flowered Kohleria.

RHS H1bUSDA 10–12Pet-safeIndoor 45–90 cm tall

Watering rhythm

7-10days

Every 7–10 days in growth; reduce in winter

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Light

Bright indirect light (just back from a sunny window)

Soil

Rich, well-drained tropical mix

Humidity

55–75%

Temp

18–28°C

Pet safety

Pet-safe

Mature size

45–90 cm tall

Care at a glance

Light

In the wild spiked kohleria grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Needs bright, indirect light to flower well. An east- or west-facing window is suitable; a south-facing position with sheer curtaining avoids leaf scorch. This species benefits greatly from supplemental grow-lights in low-light interiors, as insufficient light drastically reduces the flower spikes. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for every 7–10 days in growth; reduce in winter for spiked kohleria, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water thoroughly when the top 2 cm of soil dries out. Reduce watering in autumn as growth slows and keep rhizomes barely moist during any winter rest. Always avoid waterlogging, especially in cooler months.

Soil and pot

Spiked Kohleria grows best in rich, well-drained tropical mix. Use 2 parts peat-free all-purpose compost, 1 part perlite, and 1 part coir. A pH of 6.0–6.5 is appropriate. Rhizomes need good aeration to prevent rot. Shallow pots suit the rhizome structure. 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

Spiked Kohleria sits happiest at around 55–75% humidity and 18–28°C (64–82°F). As a tropical species, K. spicata appreciates higher humidity than some Kohleria relatives. Use a humidifier, group plants together, or place on a well-stocked pebble tray. Avoid direct misting of the hairy foliage. If you keep the room above 18–28°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 spiked kohleria sparingly. Feed every 2 weeks during spring and summer with a high-potassium liquid fertiliser (such as a tomato formula) diluted to half strength to maximise flower spike production. Use a balanced formula monthly in early spring to support initial growth. No fertiliser 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 spiked kohleria in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Spider mites — Warm, dry indoor conditions favour spider mite outbreaks on the undersides of hairy leaves, causing yellow stippling. Raise humidity, ensure regular inspection, and treat with neem oil or an appropriate miticide at the first sign of infestation.
  • Rhizome rot in wet winter conditions — If the plant is kept too wet when temperatures drop and growth slows, rhizomes rot rapidly. Taper off watering from late autumn, keeping compost barely moist, and resume normal watering only when new growth emerges in spring.
  • No flower spikes in low light — Insufficient light is the most common reason for failure to produce the characteristic flower spikes. Increase light levels significantly — ideally moving to a brighter window or adding full-spectrum grow-lights at 12–14 hours per day.

Propagation

Divide rhizomes in spring when repotting — each section with a bud will grow into a new plant. Stem-tip cuttings 8–12 cm long root quickly in moist perlite under a humidity dome at 22–24°C. Leaf cuttings produce plantlets at the petiole base. Seed germinates readily at 22–25°C on a moist, fine compost surface. 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

Spiked Kohleria is pet-safe. Kohleria spicata is a member of Gesneriaceae, which ASPCA does not list as toxic. No toxic compounds have been identified in Kohleria species. Considered pet-safe, though the hairy stem and leaf surfaces may cause mild mechanical irritation if ingested in large quantities. 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.

Spiked Kohleria care — frequently asked questions

What is the common name for Kohleria spicata?

Kohleria spicata is most commonly called Spiked Kohleria, but it is also known as Spiked Kohleria, Spike-Flowered Kohleria. The names refer to the same species, so care instructions for Spiked Kohleria apply identically to anything sold as Spike-Flowered Kohleria.

How much light does spiked kohleria need?

Spiked Kohleria grows best in bright indirect light (just back from a sunny window). Needs bright, indirect light to flower well. An east- or west-facing window is suitable; a south-facing position with sheer curtaining avoids leaf scorch. This species benefits greatly from supplemental grow-lights in low-light interiors, as insufficient light drastically reduces the flower spikes.

How often should I water spiked kohleria?

Water spiked kohleria every 7–10 days in growth; reduce in winter. Water thoroughly when the top 2 cm of soil dries out. Reduce watering in autumn as growth slows and keep rhizomes barely moist during any winter rest. Always avoid waterlogging, especially in cooler months. 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 spiked kohleria toxic to cats and dogs?

Spiked Kohleria is pet-safe. Kohleria spicata is a member of Gesneriaceae, which ASPCA does not list as toxic. No toxic compounds have been identified in Kohleria species. Considered pet-safe, though the hairy stem and leaf surfaces may cause mild mechanical irritation if ingested in large quantities.

What USDA hardiness zone does spiked kohleria grow in?

Spiked 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.

Spiked Kohleria deep-dive guides

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

Featured in these plant shortlists

Spiked Kohleria qualifies for 7 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Spiked Kohleria is also commonly called Spiked Kohleria or Spike-Flowered Kohleria.