Cape Sundew (sundew) care

Light

Bright but filtered. Cape Sundew burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Wants very bright light, ideally 6-8+ hours daily; a sunny south or east window or a grow light is ideal. Good light is what produces the red colour and the sticky dew. Acclimate gradually to direct sun, as unhardened plants can scorch behind hot afternoon glass. 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 cape sundew: keep constantly moist; never let it dry out. 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. Use ONLY distilled, reverse-osmosis, or rainwater (under ~50 ppm TDS) - tap-water minerals will kill it. Stand the pot in a tray with 1-2 cm of water (the tray method) and top up as it evaporates. Avoid pouring water over the dewy leaves.

Soil and pot

Cape Sundew grows best in nutrient-poor carnivorous-plant mix. A 1:1 blend of sphagnum peat moss and perlite or silica sand. Never use regular potting soil, compost, or any fertiliser-enriched medium - added nutrients are fatal. Plant in a plastic pot with drainage; avoid terracotta, which leaches minerals. 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

Cape Sundew sits happiest at around 50% or higher preferred humidity and 15-29 C (60-85 F). Appreciates 50%+ humidity to keep the dew droplets plump, but it is more forgiving than many carnivores once established. The tray method raises local humidity; a covered terrarium or humidity tray helps in dry rooms, especially with heating running in winter. If you keep the room above 15 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 cape sundew sparingly. Never fertilise the soil - root fertiliser kills carnivorous plants. The plant feeds itself by catching insects on its sticky leaves. Indoors, where prey is scarce, you can occasionally place a small dried insect or freeze-dried bloodworm on an active leaf. Do not overfeed, and never feed it meat. 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 cape sundew in the Growli community. Each is annotated with the most common cause so you know where to start.

• No dew / not sticky — Almost always too little light. Move to a brighter spot or add a grow light; dew also pauses briefly while a leaf digests prey or in very dry air.
• Brown, dying leaves from tap water — Mineral buildup from tap or bottled spring water burns the roots. Switch immediately to distilled, RO, or rainwater and flush the soil.
• Plant collapsing or rotting — Usually fertiliser or rich potting soil in the mix, which is fatal. Repot into pure peat-and-perlite carnivorous mix with no added nutrients.
• Sudden leaf dieback / dormancy — Triggered by cold exposure. This subtropical species needs no winter dormancy; keep it warm and frost-free year-round.
• Dried out and crispy — It must never dry out. Keep the tray topped up with mineral-free water at all times.
• Fungus gnats or mould in terrarium — Excess stagnant humidity with poor airflow. Improve ventilation; the sundew will actually trap many of the gnats itself.

Propagation

Very easy. Leaf cuttings are simplest: lay a healthy leaf on damp peat moss in bright, humid conditions and plantlets sprout within weeks. It also self-pollinates and sets abundant seed that germinates readily when surface-sown on moist carnivorous mix. Root cuttings and dividing mature clumps also work. 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

Cape Sundew is mildly toxic to pets. Drosera capensis is not listed in the ASPCA toxic or non-toxic plant database, and no Drosera-genus species appears there, so a clean pet-safe rating cannot be confirmed. Sundews are not known to contain toxic compounds and growers widely treat them as harmless, but because there is no authoritative listing, treat as mildly toxic and contact your vet if a pet ingests one. 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.

Cape Sundew deep-dive guides

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

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

Related guides

Cape Sundew is also known as Cape sundew, Cape sundew plant, and sundew.

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