Houseplant · Droseraceae
Cape Sundew
Drosera capensis
Set it in bright sun with pure rainwater, and the Cape sundew turns a windowsill into a small, glittering wonder all year.
Full sun
Every 1–3 days
41–86°F · 5–30°C
180–365 days
Overview
There is something quietly theatrical about keeping a plant that hunts. The Cape sundew arrives from the bogs of South Africa with a talent for catching insects rather than living on soil alone, and that makes it a natural conversation piece on any sill. Its leaves carry red dew-tipped tentacles that glisten like beads of nectar, drawing in gnats and flies that settle, stick, and are slowly digested. A member of the family Droseraceae, it stays compact, a small rosette just a few inches across that asks for very little room.
Its charm comes with a short list of preferences, and honoring them becomes part of the pleasure. The plant grew up in nutrient-poor, acidic ground, so it turns up its nose at ordinary potting soil and fertilizer entirely. Water is the same story: the salts in tap and mineral water gather and poison it, which makes a jug of distilled, reverse-osmosis, or rainwater a small, satisfying part of the weekly routine.
Attend to those two things and the Cape sundew settles into daily life as one of the easiest carnivorous plants to live with. It holds court on a bright windowsill through every season, glowing a deep red where the light is strongest, so it reads as much like a jewel as a houseplant. It also self-seeds so freely that one plant soon becomes a little collection, ready to scatter across sills or give away.
Care
The short version: give it your sunniest sill, keep the pot resting in mineral-free water so the peat mix never dries, and pour nothing but distilled, RO, or rainwater while leaving the roots unfed.
Light
Reserve your brightest spot for the Cape sundew, ideally a south-facing sill that catches several hours of direct sun. That light is what deepens the tentacles to red and keeps the rosette neat and gathered, the look most growers are after, while a shadowy corner leaves it pale and loose. Where a bright window is missing, a strong grow light stands in without spoiling the effect.
Water
Water is the ritual that keeps this plant at its best. Reach only for distilled, reverse-osmosis, or rainwater, since the salts in tap and mineral water build up and finish off carnivorous plants. Stand the pot in a shallow tray of 1 to 3 cm of that mineral-free water so the peat mix stays evenly wet, easing back just slightly in winter and never letting it run dry.
Soil
Give it a home in a lean, acidic carnivorous mix, roughly equal parts peat moss or live sphagnum with sand or perlite, kept at a pH around 4.0 to 5.5. Regular potting soil, compost, and anything fertilized are best kept far from it, since they burn the roots.
Temperature
This is an agreeable plant when it comes to warmth, at ease anywhere from about 41°F to 86°F (5°C to 30°C). Ordinary room temperature carries it comfortably through the year, with no cold winter rest to schedule the way some carnivorous plants demand.
Humidity
It prefers the air a touch humid, around 50% to 80%, a mood the standing water tray helps set on its own. It lives with average household air more gracefully than most carnivorous plants, though a very dry room can leave the dew looking subdued.
Feeding
Leave the roots unfed, always. Having come from nutrient-poor bogs, they scorch under soil fertilizer, so the plant draws its nitrogen from the gnats and flies it gathers on its own dew. Set indoors, it usually catches all it needs without any help from you.
Pruning
Upkeep here is light and occasional. Trim away any fully blackened or dead leaves and spent flower stalks at the base with clean scissors to keep the display tidy. Let the sticky dew stay put, though, since wiping it off strips the plant of the very thing that feeds it.
Repotting
Refresh its pot every 1 to 2 years in spring, settling it into new carnivorous mix. Move earlier if the roots begin circling, the rosettes crowd into a clump, or the old mix breaks down and stays heavy and wet.
Size & spacing
This is a small, well-mannered plant, a rosette rising only 2 to 14 inches (5 to 35 cm) and spreading 3 to 6 inches (8 to 15 cm) wide. Its modest footprint lets it slip in among books, candles, or other pots on any bright sill without crowding the scene.
Troubleshooting
When a sundew looks off, the story almost always traces back to two things: the water it drinks or the light it gets. The leaves tell the tale plainly enough. Read the signs below, then adjust its spot or its water before the plant loses its shine.
The dew loses its glimmer
When the tentacles turn dry and dull, the trouble is nearly always the wrong water, since tap and mineral water leave salts behind that poison a carnivorous plant. Thin light or dry air can dim the dew as well. Switch to distilled, reverse-osmosis, or rainwater, flush the mix to rinse the salts out, then give the plant a brighter, more humid spot so its new leaves 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 darken to black
Blackening leaves usually signal mineral buildup from the wrong water, though a recent repot or the plant's own leaf cycle can bring on the same look. The giveaway is which leaves go: when only the older ones darken while fresh growth rises up healthy, it is simply the plant turning over. Correct the water, trim the spent leaves at the base, and keep conditions steady, wet, and bright while it recovers its poise.
Fix:
- Correct the water source to mineral-free water
- Remove blackened leaves at the base
- Maintain stable wet conditions and bright light during recovery
Pale, stretched growth as the red drains away
A sundew that fades to green and lengthens is quite plainly starved for light. Under full sun the tentacles and leaf blades flush a deep red and the rosette draws in tight, the look worth chasing. Shift 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
For a home with pets or children underfoot, the Cape sundew is an easy houseguest, since it is not toxic to anyone. The sticky dew along its leaves is a harmless mucilage that may cling to a finger or a paw for a moment before wiping clean away. The one thing to mind is where it sits, so a curious pet cannot upend the water tray.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
A cat may sniff or nibble a sundew and come away untouched, since the plant holds no toxin. A little dew might cling to the whiskers for a moment before it washes off, leaving no irritation behind.
Dogs Safe
A dog is in no danger here. Should one chew a leaf, the most to expect is a harmless smudge of sticky residue on the muzzle.
Horses Safe
Nothing about this plant would trouble a horse, and its small size makes it an unlikely mouthful in any case.
Rabbits Safe
A rabbit can share a room with a sundew in complete safety. A nibbled leaf brings no poisoning, only the occasional dab of dew on the fur.
Livestock Safe
Goats, sheep, and cattle face no risk from the plant. Its dew is sticky rather than harmful, and the tiny rosette offers next to nothing to graze.
Birds Safe
A bird comes to no harm beside a sundew. Its glistening tentacles are made to catch gnats and flies, never to threaten anything larger.
People Safe
The plant is a pleasure to handle safely, its dew a simple mucilage that wipes from the skin. Leave it on the leaves, though, for 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 turns up in a few easy-to-find forms, each with its own leaf shape and coloring to suit a shelf or a scheme. These three are the ones most often on offer.
Drosera capensis 'Typical'
The most widely grown form wears narrow green strap-like leaves tipped with red dew, and its easy temperament makes it the natural starting point for most collectors.
Drosera capensis 'Alba'
Having given up its red pigment, this all-green form keeps pale tentacles and opens its flowers in white, a softer look for a quieter corner.
Drosera capensis 'Red'/'Wide Leaf'
Set in bright light, this form unfurls broader leaves washed a strong red across the blade, the boldest of the three on a shelf.
How to propagate
Part of this plant's appeal is how readily it makes more of itself, which turns a single pot into a growing display. A leaf, a scattering of its freely set seed, or a divided clump will each give you fresh plants to place around the house.
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 in full growth. Lay a healthy leaf on damp mineral-free carnivorous mix or float it in mineral-free water, and small plantlets appear along it within 4 to 10 weeks, then spend several more months growing into full-size plants to place around the house.
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 generously, this is the simplest route of all. Scatter the seed over damp peat mix in spring and leave it open to the light, which it needs to sprout. Germination comes in 2 to 6 weeks with no chilling required, and a mature rosette follows a few months on.
DivisionEasy
Spring at repotting · A few weeks to re-establish
At the spring repotting, an established clump can be parted into separate plants. Ease apart the offset rosettes with their roots attached, pot each into fresh carnivorous mix, and they settle back in within a few weeks, ready to spread across new sills.
Myths
Sundews must be hand-fed insects or they will starve.
Like any green plant, a sundew makes its own food through photosynthesis, and it catches ample small insects with no help at all. Feeding it by hand is optional, never a requirement, and one kept indoors usually gathers every gnat it needs on its own.
The sticky dew should be misted or wiped away to keep the leaves clean.
That dew is the plant's prey-trapping mucilage, so wiping it away robs the sundew of the very thing that sustains it. Misting with tap water does double harm, leaving behind the minerals that poison carnivorous plants.
Carnivorous plants need rich soil and fertilizer to thrive.
Sundews came up in nutrient-poor, acidic bogs, and their roots simply cannot bear a rich diet. Ordinary soil and fertilizer burn the roots and kill the plant, which is why a lean peat-and-sand mix is the one safe choice.