What is a sundew?
The Cape Sundew (Drosera capensis) is a carnivorous perennial native to the Cape region of South Africa. Each leaf is lined with hair-like tentacles tipped with a glistening, sticky mucilage — Darwin called it “the most wonderful plant in the world.” When an insect lands on a leaf, the tentacles bend inward within minutes and the leaf slowly curls around the prey, secreting digestive enzymes that absorb the nutrients. Unlike the dramatic snap of a Venus flytrap, the sundew is a slow, creeping ambush.
Cape Sundew is the recommended starting point for carnivorous plant beginners: it tolerates a wider temperature range than most, self-seeds freely, and recovers from neglect more readily than its carnivorous cousins.
How much light does a sundew need?
Sundews need as much direct sun as possible — at least four to six hours of direct light daily. On a bright south-facing windowsill the tentacles turn a deep red-orange, a sign the plant is thriving. In lower light the tentacles stay green and the dew disappears. If you cannot offer a sunny windowsill, a full-spectrum LED grow light set on a 14-hour timer placed a few inches above the rosette works very well.
How do you water a sundew?
Always use the tray method and always use mineral-free water (rainwater, distilled, or reverse-osmosis). Set the pot in a shallow dish and keep half an inch of water in it at all times — sundews come from permanently wet bogs.
Tap water is the most common killer of carnivorous plants. Even “soft” tap water contains enough dissolved minerals to cause root damage within weeks.
What soil and pot does a sundew need?
Use a nutrient-poor, acidic mix — the classic recipe is 50% peat moss and 50% perlite, or pure long-fibred sphagnum moss. Never use standard potting compost, garden soil, or any mix with added fertiliser; the extra nutrients burn the roots. A plastic pot with drainage holes sitting in the tray is ideal — avoid terracotta, which leaches minerals.
Do not fertilise the soil. If you want to supplement, mist a dilute orchid fertiliser (at one-quarter the recommended strength) onto the leaves once a month during the growing season — the leaves absorb it rather than the roots.
Does a sundew need to eat insects to survive?
Not strictly, but feeding helps. A sundew photosynthesises like any other plant and will survive without prey, especially under a grow light. However, catching or receiving insects accelerates growth and produces larger, more vigorous traps. Indoors you can occasionally offer a small live insect, a rehydrated freeze-dried bloodworm, or a tiny piece of fish flake pressed gently onto a tentacle. Feed no more than once every two to three weeks and only healthy traps.
Is a sundew safe for pets?
Yes. Sundews are not known to be toxic to cats and dogs. The sticky mucilage and enzymes are effective at trapping and digesting insects but pose no significant risk to mammals. The ASPCA does not list Drosera as a toxic plant. The main concern is the other way around — a curious cat batting at the leaves can damage the delicate tentacles, so keep the plant somewhere out of paw’s reach.