Houseplant · Droseraceae
Cape Sundew
Drosera capensis
Offer it bright sun and clean rainwater, and the Cape sundew will reward you with dewy, insect-catching leaves right through the year.
Full sun
Every 1–3 days
41–86°F · 5–30°C
180–365 days
Overview
Take heart if carnivorous plants feel intimidating, because the Cape sundew is a kind first choice. It comes from the boggy ground of South Africa, where it learned to catch insects rather than lean on the soil for every meal. Each little leaf is fringed with red dew-tipped tentacles that sparkle like beads of nectar, and the gnats and flies drawn in stick fast and are digested at a slow, patient pace. It belongs to the family Droseraceae and stays wonderfully small, a neat rosette only a few inches wide.
The very thing that makes it special also makes it a little particular, but nothing here is hard once you know it. This plant grew up in nutrient-poor, acidic ground, so ordinary potting soil or fertilizer will overwhelm its roots. Its water asks for the same care: tap and mineral water carry salts that slowly gather and harm the plant, which is why distilled, reverse-osmosis, or rainwater is simply the way to keep it happy.
Get the soil and the water right, and you will find the Cape sundew is among the most forgiving carnivorous plants to look after. It settles in on a bright windowsill and grows all year, turning a deep red when the light is strong. Best of all, it self-seeds so generously that you will soon have little ones to share, and a slip along the way is almost always something the plant can bounce back from.
Care
The short version: give it the brightest light you can, keep the pot sitting in mineral-free water so the peat mix never dries, and resist feeding the roots or reaching for anything but distilled, RO, or rainwater. Do those, and you are most of the way there.
Light
Give your Cape sundew the sunniest spot in the house, ideally a south-facing sill with several hours of direct sun. That strong light is what brings the tentacles into their rich red and keeps the rosette snug, while a shadowy corner leaves it pale and reaching. If your windows are on the dim side, a good grow light fills the gap beautifully.
Water
This is the part that matters most, so it is worth getting comfortable with. Use only distilled, reverse-osmosis, or rainwater, because the salts in tap and mineral water gather and harm carnivorous plants. Stand the pot in a tray holding 1 to 3 cm of that mineral-free water so the peat mix stays thoroughly wet, and in winter you can ease back just a touch, though never let it dry out.
Soil
Settle it into a lean, acidic carnivorous mix, roughly equal parts peat moss or live sphagnum with sand or perlite, sitting around a pH of 4.0 to 5.5. Steer clear of regular potting soil, compost, or anything fertilized, since those will burn the roots.
Temperature
Happily, the Cape sundew is easygoing about warmth, content anywhere from about 41°F to 86°F (5°C to 30°C). Normal room temperature keeps it content all year, and unlike some carnivorous plants it asks for no chilly winter rest.
Humidity
It enjoys air on the humid side, around 50% to 80%, and the tray of water beneath it helps with that on its own. This sundew copes with everyday household air better than most of its carnivorous cousins, though a very dry room can leave the dew a little sparse.
Feeding
There is no need to feed the roots, and doing so does more harm than good. The plant came from nutrient-poor bogs, so soil fertilizer scorches its roots, and it prefers to gather its nitrogen from the gnats and flies caught on its dew. Grown indoors, it usually catches everything it needs by itself.
Pruning
Happily, there is very little to do. Simply snip away any fully blackened or dead leaves and spent flower stalks at the base with clean scissors to keep things neat. Do leave the sticky dew be, since wiping it off takes away the plant's own way of catching a meal.
Repotting
Give it fresh footing every 1 to 2 years, ideally in spring, by moving it into new carnivorous mix. Go a little sooner if you notice roots circling the pot, the rosettes crowding into a clump, or the old mix breaking down and staying soggy.
Size & spacing
This is a small, undemanding plant, a rosette that reaches only 2 to 14 inches (5 to 35 cm) tall and spreads about 3 to 6 inches (8 to 15 cm) wide. That compact size means it tucks easily onto any bright windowsill, even a crowded one.
Troubleshooting
Nearly every hiccup with a sundew comes back to just two things, the wrong water or too little light, and both are easy to put right. Let the leaves guide you, since they show trouble early. Find the match below and gently correct it, and your plant should come around.
Dewdrops fading from the leaves
If the tentacles turn dry and dull, the culprit is almost always the wrong water, since tap and mineral water leave salts behind that quietly poison a carnivorous plant. Thin light or dry air can slow the dew too. Take heart and switch to distilled, reverse-osmosis, or rainwater, flush the mix to rinse those salts away, then move the plant somewhere brighter and more humid, and the fresh leaves will glisten again.
Fix:
- Switch immediately to distilled, RO, or rainwater
- Flush the mix with mineral-free water to leach out salts
- Move to brighter light and raise humidity
Leaves darkening and dropping away
Blackening leaves usually mean mineral buildup from the wrong water, though a recent repot or the plant's own leaf cycle can bring it on as well. The gentle clue is which leaves go: when only the older ones darken while healthy new ones rise up, that is simply normal turnover and nothing to worry over. Correct the water source, trim the dead leaves at the base, and hold to steady wet, bright conditions while it recovers.
Fix:
- Correct the water source to mineral-free water
- Remove blackened leaves at the base
- Maintain stable wet conditions and bright light during recovery
Growth going pale and leggy as the red fades
A sundew that fades to green and stretches tall is simply starved for light, and the fix is a happy one. Given full sun, the tentacles and leaf blades blush a deep red and the rosette draws in tight and compact. Move it to a sunnier window or under strong grow lights, and raise the brightness over a few days so the leaves settle in without scorching.
Fix:
- Move to a sunnier window or add strong grow lights
- Acclimate gradually to avoid scorching
Toxicity
Here is a comforting fact for a busy home: the Cape sundew is not toxic to anyone, people or pets. The sticky dew on its leaves is a gentle mucilage that might cling to a finger or a paw for a moment and then wipes away without any sting. The one thing worth a glance is the water tray, which a playful pet could tip over.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
A curious cat can sniff or taste a sundew with no harm at all, since the plant holds no toxin. A little dew might cling to the whiskers for a moment, but it rinses away and leaves no irritation behind.
Dogs Safe
Your dog is in no danger from this plant. Should one chew a leaf, the worst to expect is a harmless dab of sticky residue on the muzzle.
Horses Safe
There is nothing here to trouble a horse, and the plant is so small it would hardly make a mouthful in the first place.
Rabbits Safe
Rabbits can share a room with a sundew in comfort. A nibbled leaf brings no poisoning, only the occasional dab of dew on the fur.
Livestock Safe
Goats, sheep, and cattle have nothing to fear from the plant. The dew is sticky rather than harmful, and the tiny rosette offers next to nothing worth grazing.
Birds Safe
Birds come to no harm around a sundew. Its glistening tentacles are made to catch gnats and flies, never anything larger.
People Safe
The plant is perfectly safe to handle, and the dew is a simple mucilage that wipes off the skin. Do leave it on the leaves, though, because that dew is how the sundew feeds itself.
The dew is a harmless sticky mucilage; it may briefly cling to skin or fur but causes no irritation. Avoid wiping it off the plant, as it is the trapping mechanism.
Varieties
Drosera capensis comes in a handful of easy-to-find forms, and they differ mostly in the shape and color of their leaves. Any of these makes a lovely, beginner-friendly place to begin.
Drosera capensis 'Typical'
The most commonly grown form wears narrow green strap-like leaves tipped with red dew, and its easygoing nature makes it the gentlest one for a beginner to start with.
Drosera capensis 'Alba'
This all-green form has set aside its red pigment, so the tentacles stay soft and pale and the flowers open a clean white.
Drosera capensis 'Red'/'Wide Leaf'
Grown in bright light, this form spreads broader leaves washed a strong red clear across the blade.
How to propagate
Few plants make new plants as happily as the Cape sundew, which is part of the fun. You can raise it from a single leaf, from the seed it sets so freely, or by dividing an older clump, and each way is forgiving enough for a first try.
Leaf cuttingsEasy
Spring to summer during active growth · 4-10 weeks for plantlets to form, several months to reach size
Take a leaf cutting in spring or summer, while the plant is growing strong. Lay a healthy leaf on damp mineral-free carnivorous mix, or simply float it in mineral-free water, and tiny plantlets will appear along it within 4 to 10 weeks, then spend several more months filling out to full size.
SeedEasy
Spring; surface-sow on damp peat mix in light · 2-6 weeks to germinate, several months to a mature rosette
Because Drosera capensis pollinates itself and sets seed so freely, this is the easiest path of all. Scatter the seed over damp peat mix in spring and leave it uncovered, since it needs light to wake up. Sprouting takes 2 to 6 weeks with no chilling needed, and a full rosette follows a few months on.
DivisionEasy
Spring at repotting · A few weeks to re-establish
When spring repotting comes around, an established clump is happy to be split into separate plants. Gently tease apart the offset rosettes with their roots still attached, pot each into fresh carnivorous mix, and they settle in within a few weeks.
Myths
Sundews will starve unless you hand-feed them insects.
Like any green plant, a sundew makes its own food through photosynthesis, and it catches plenty of little insects without any help. Feeding it by hand is optional, never a requirement, and a plant grown indoors usually snares all the gnats it could want.
The sticky dew should be misted or wiped off to keep the leaves clean.
That dew is the plant's prey-catching mucilage, so wiping it away takes from the sundew the very thing that feeds it. Misting with tap water does double harm, since it also leaves behind the minerals that poison carnivorous plants.
Carnivorous plants need rich soil and fertilizer to do well.
Sundews grew up in nutrient-poor, acidic bogs, and their roots simply cannot cope with a heavy diet. Ordinary soil and fertilizer burn the roots and kill the plant, which is exactly why a lean peat-and-sand mix is the only safe home for it.