Tropical Sundew (Burmann's sundew) care

Light

Tropical Sundew 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. Thrives in at least 4-6 hours of bright indirect light daily; a sunny south- or east-facing windowsill or supplemental grow lights (12-14 h/day) suit it best. Direct midday sun can scorch the delicate tentacles under glass. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water tropical sundew keep tray permanently wet. 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. Sit the pot in 1-2 cm of distilled, rainwater, or reverse-osmosis water at all times using the tray method. Never allow the medium to dry out and never use tap water — dissolved minerals kill carnivorous plants rapidly.

Soil and pot

Tropical Sundew grows best in nutrient-poor, acidic carnivore mix. Use a 1:1 mix of peat moss (or coir) and perlite or washed coarse sand. No fertiliser, compost, or bark — any nutrient enrichment damages roots adapted to near-sterile conditions. 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

Tropical Sundew sits happiest at around 60-90% humidity and 18-32°C (64-90°F). As a tropical species it prefers consistently high humidity. A humidity tray, cloche, or terrarium helps indoors during dry winters; low humidity causes tentacle die-back and poor trapping. 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 tropical sundew sparingly. Do not fertilise the soil. Feed by allowing the plant to catch live or freeze-dried insects (e.g., fruit flies, small crickets) every 2-4 weeks during the growing season. Foliar feeding with extremely dilute MaxSea (1/4 strength, once monthly) is occasionally used by specialists but is not necessary. 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 tropical sundew in the Growli community. Each is annotated with the most common cause so you know where to start.

• Tentacle collapse and black leaves — Usually caused by tap water mineral build-up or drought. Switch immediately to distilled or rainwater and maintain a permanently wet tray.
• Failure to produce sticky dew — Insufficient light is the most common cause. Move to a brighter location or increase grow-light duration to 14 hours per day.
• Fungal damping-off — Stagnant air combined with high humidity encourages Botrytis. Ensure gentle airflow and remove dead leaves promptly.

Propagation

Seed is the primary method — D. burmannii self-seeds prolifically; surface-sow fresh seed on moist peat/perlite under bright light (no covering required). Leaf cuttings placed flat on moist medium in high humidity will also produce plantlets within 6-8 weeks. 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

Tropical Sundew is pet-safe. Drosera species are listed by ASPCA as non-toxic to dogs and cats. The sticky mucilage is not harmful if ingested, though it may cause mild gastric irritation from the digestive enzymes. 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.

Tropical Sundew deep-dive guides

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

• Tropical Sundew watering schedule
• Tropical Sundew light requirements
• Best soil mix for tropical sundew
• Tropical Sundew fertilizing guide
• When to repot tropical sundew
• How to propagate tropical sundew
• Tropical Sundew growth rate & size
• Tropical Sundew cold hardiness
• Tropical Sundew temperature & humidity
• Is tropical sundew toxic to cats & dogs?
• Is tropical sundew toxic to cats?
• Is tropical sundew toxic to dogs?

Featured in these plant shortlists

Tropical Sundew qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• 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 humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Best small pet-safe plants — Compact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Tropical Sundew is also commonly called tropical sundew or Burmann's sundew.

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