King Sundew (regal sundew) care

Light

King Sundew needs sun on the leaves, not just bright ambient room light. Wants the strongest light you can give indoors: a south or west window with several hours of direct sun, or a strong grow light 15-25 cm above the crown. Weak light makes leaves green, floppy and stingy with dew. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water king sundew keep the pot standing in 1-2 cm of water at all times; top up before the tray runs dry. 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. Use only rainwater, distilled or reverse-osmosis water (under ~50 ppm TDS). Tap-water minerals build up and kill the roots. Tray-water the pot from below; never let the medium fully dry.

Soil and pot

King Sundew grows best in nutrient-free carnivorous mix. Classic blend of sphagnum peat with sharp silica sand or perlite (roughly 1:1). Never use ordinary potting soil, compost or anything with added fertiliser, which scorches the fine roots. Many growers favour pure long-fibre sphagnum for this species. 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

King Sundew sits happiest at around 50-70% humidity and 18-28°C (64-82°F). Appreciates moderate to high humidity, which helps the mucilage stay sticky, but tolerates average room air better than most tropical sundews if kept well watered. Avoid sealing it in a stagnant terrarium without airflow. 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 king sundew sparingly. Do not fertilise the soil. This plant feeds by catching insects; in a bug-free room, drop a small gnat, fruit fly or rehydrated bloodworm onto an active leaf every couple of weeks during growth. Very dilute foliar carnivorous-plant feed is optional but never root fertiliser. 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 king sundew in the Growli community. Each is annotated with the most common cause so you know where to start.

• Mineral burn from tap water — Using tap or filtered (not RO/distilled) water makes leaf tips brown and the plant decline. Switch to rainwater, distilled or reverse-osmosis water only.
• No dew / green floppy leaves — Almost always too little light. Move to direct sun or a strong grow light; healthy leaves are tinged red and beaded with mucilage.
• Root rot in stagnant warmth — King sundew has a sensitive root system; constant warm, airless, soggy conditions invite rot. Give airflow and let it cool in winter rather than baking it year-round.
• Skipped winter dormancy — This species benefits from a cooler (around 5-12°C), drier winter rest. Kept hot all year it weakens over time and may collapse.

Propagation

Most reliably by root cuttings: lay 2-5 cm sections of healthy root on damp sphagnum and keep humid and bright until plantlets sprout. Also leaf cuttings floated on wet peat, and seed (slow). Division of established crowns is possible but slow. 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

King Sundew is mildly toxic to pets. Drosera (sundews) is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, so its safety status is unverified; treat with caution and verify with a vet before allowing pet access. The sticky mucilage can also cause mild mouth or gut irritation if chewed. Keep out of reach of curious cats and dogs. 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.

King Sundew deep-dive guides

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

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

Featured in these plant shortlists

King Sundew qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

King Sundew is also commonly called king sundew or regal sundew.

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