Cape Sundew
Quick Facts & Botanical Stats
Species Overview
What is a cape sundew? The cape sundew (Drosera capensis) is a small carnivorous plant belonging to the Droseraceae family. Native to South Africa, it is one of the most famous sundew species. How do sundews trap insects? It uses flypaper-like traps, consisting of leaves lined with tentacles that secrete sticky, glistening droplets of mucilage. Insects are attracted to the drops, get stuck, and the leaf slowly rolls up around them to digest them and extract nutrients.
Physical Appearance & Anatomy
What does a cape sundew look like? The cape sundew grows in a rosette of narrow, strap-like leaves up to 15 cm long. The leaves are covered in red glandular tentacles that secrete a clear, sticky glue (mucilage) that glistens in the sun like morning dew. How does the leaf move? When an insect is trapped, the leaf curls lengthways around the prey through thigmotropism. In summer, the plant produces tall flower spikes with small, five-petaled, bright pink flowers.
Habitat & Growth Behavior
Where do cape sundews grow in the wild? Cape sundews grow in permanently damp, acidic, nutrient-deficient bogs and marshes in South Africa. They prefer full sun and consistent moisture. Why do their leaves bend? When an insect touches the tentacles, the physical contact triggers electrical signals that cause the leaf cells to bend the leaf over the prey within hours. This maximizes contact with digestive glands.
Ecological Role & Symbioses
What do sundews eat? They feed on small flying insects such as gnats, fruit flies, and mosquitoes. Do they help control pests? Yes, they are highly effective natural pest controllers, trapping insects that enter their bog habitats. The pink flowers grow on stalks up to 30 cm high to ensure that visiting pollinators are not accidentally trapped and eaten by the sticky leaves.
Reproduction, Lifecycle & Propagation
Cape sundews reproduce sexually via self-pollinating flowers. The flowers open for only a few hours on sunny days. After pollination, the flowers produce small capsules containing hundreds of tiny seeds. The seeds are dispersed by wind and water. The plant is incredibly hardy: if top growth is damaged by frost or drought, it can sprout new leaves from its thick root system. They live for 5 to 10 years.
Conservation Status & Environmental Threats
Drosera capensis is classified as Least Concern on the IUCN Red List. It is abundant in South Africa and is one of the easiest carnivorous plants to cultivate, grown by millions of plant hobbyists. Wild populations are generally stable, though wetland degradation and invasive weeds present localized threats. It is considered an invasive weed in some damp regions of New Zealand.
Interesting Fun Facts
- The sticky droplets on sundew leaves glisten in the sun like morning dew, giving the plant its common name 'sundew'.
- When an insect gets stuck, the sundew leaf can roll completely around the prey in a few hours to digest it.
- The sticky mucilage contains digestive enzymes similar to those found in the human stomach.
- Cape sundews are so hardy that they can grow back from their roots even if their leaves are destroyed by frost or fire.
Related Plants
Venus Flytrap
EndangeredWhat is a Venus flytrap? The Venus flytrap (Dionaea muscipula) is a small carnivorous plant belonging to the Droseraceae family. Native exclusively to the nitrogen-poor coastal bogs of North and South Carolina, it is globally famous for its rapid, active leaf traps. Why is the Venus flytrap carnivorous? Because it grows in nutrient-starved, acidic soil, it has evolved traps to catch insects, digesting them to absorb essential nitrogen and phosphorus. Charles Darwin famously described the Venus flytrap as 'one of the most wonderful plants in the world'.
Tropical Pitcher Plant
Least ConcernWhat is a tropical pitcher plant? Nepenthes rafflesiana is a species of carnivorous climbing vine belonging to the Nepenthaceae family. Native to the hot, humid lowlands of Borneo and Sumatra, it is famous for its large, urn-shaped pitcher leaves that trap and digest prey. How do pitcher plants catch insects? Unlike the active Venus flytrap, pitcher plants use passive pitfall traps. Insects are lured by nectar, slip on the waxy rim, fall into a pool of digestive fluid, and dissolve.