Cape Sundew

Drosera capensis is endemic to the Western Cape province of South Africa, particularly the Cape Floristic Region — one of the world's six recognized floral kingdoms and the smallest yet most species-dense.

• Native range is restricted to the Cape region of South Africa, where it grows in seasonally wet, nutrient-poor fynbos and wetland habitats
• The Cape Floristic Region is a UNESCO World Heritage Site, harboring approximately 9,000 plant species, nearly 70% of which are found nowhere else on Earth
• The genus Drosera has a global distribution with over 200 species, but the Cape region of South Africa is a significant center of diversity for the genus
• Drosera capensis has become naturalized in several regions outside its native range, including parts of Australia, New Zealand, California, and various European countries, where it is sometimes considered an invasive species

The Cape Sundew is a perennial, herbaceous carnivorous plant that forms a basal rosette of narrow, elongated leaves.

Leaves:
• Strap-shaped (linear-lanceolate), typically 2.5–5 cm long and 3–5 mm wide
• Arranged in a basal rosette; older leaves lie flat while younger ones are more erect
• Each leaf is densely covered with stalked glandular trichomes (tentacles), numbering in the hundreds per leaf
• Tentacle tips secrete glistening droplets of clear, sticky mucilage that attract, trap, and digest insect prey
• Leaf margins bear longer tentacles that can bend inward to help secure struggling prey
• When stimulated by prey contact, the leaf blade slowly curves inward (thigmotropism) to maximize contact with the trapped insect — a process that can take several hours to complete

Tentacles & Mucilage:
• Each tentacle consists of a slender stalk (2–5 mm long) topped with a bulbous gland
• The gland secretes a complex mucilage composed of acidic polysaccharides, giving it a highly viscous, sticky consistency
• Mucilage droplets are hygroscopic — they absorb moisture from the air and remain glistening even in dry conditions
• Digestive enzymes (including proteases, esterases, and peroxidases) are released upon prey contact to break down insect tissues

Flowers:
• Produces one or more slender, erect scapes (flower stalks) reaching 15–30 cm tall
• Flowers are small (~1–2 cm diameter), with five pink to pale violet petals
• Blooms in summer; flowers open one at a time, each lasting only a single day
• Primarily self-pollinating (autogamous), which contributes to its ease of cultivation and tendency to naturalize outside its native range

Roots:
• Root system is relatively small and underdeveloped compared to non-carnivorous plants
• Roots serve primarily for anchorage and water uptake rather than nutrient acquisition — the plant obtains most of its nitrogen and phosphorus from captured prey

Seeds:
• Produces abundant tiny, black, spindle-shaped seeds (~0.5 mm long)
• A single plant can produce thousands of seeds per season
• Seeds are easily dispersed by wind and water, contributing to the species' invasive potential in non-native regions

In its native habitat, Drosera capensis occupies seasonally wet, nutrient-poor environments where carnivory provides a critical competitive advantage.

Habitat:
• Grows in damp sandy or peaty soils along stream margins, seepage zones, and seasonal wetlands in the Cape Floristic Region
• Prefers open, sunny positions with consistently moist to waterlogged substrates
• Often found growing alongside other carnivorous plants such as Utricularia (bladderworts) and in association with restios and ericoid shrubs typical of fynbos vegetation

Carnivorous Strategy:
• Employs a "flypaper trap" mechanism — the sticky mucilage on tentacles passively captures small arthropods, particularly flies, gnats, mosquitoes, and other small flying insects
• Prey is attracted by the glistening mucilage droplets, which may reflect ultraviolet light and possibly emit volatile attractants
• Upon contact, the mucilage adheres to the insect's legs and wings; struggling causes it to become further entangled
• Tentacles bend toward the prey center (thigmotropic response), and the leaf blade slowly curls to envelop the insect
• Digestion takes approximately 1–3 days, after which the leaf reopens and the indigestible exoskeleton is left behind or blown away by wind

Nutrient Acquisition:
• The primary ecological benefit of carnivory is supplementation of nitrogen and phosphorus, which are severely limited in the acidic, waterlogged soils where the plant grows
• Studies have shown that prey-derived nitrogen can constitute a significant proportion of the plant's total nitrogen budget

Reproduction:
• Flowers are self-compatible and capable of autonomous self-pollination, ensuring seed set even in the absence of pollinators
• Seeds germinate readily on moist, nutrient-poor substrates
• In cultivation and in naturalized populations, the species reproduces prolifically and can quickly colonize suitable wetland habitats

Drosera capensis is one of the easiest carnivorous plants to grow and is often recommended as an ideal beginner species. It is notably more tolerant of variable conditions than many other sundews.

Light:
• Prefers bright, direct sunlight — at least 4–6 hours of direct sun daily for optimal growth and vivid red coloration
• Can tolerate partial shade but will produce greener, less compact growth
• Under strong light, tentacles develop a deep red to burgundy pigmentation (anthocyanin production)

Water:
• Must be kept consistently wet at all times; use the tray method (standing the pot in 1–2 cm of water)
• Use only pure water: distilled, reverse osmosis, or rainwater — never tap water, as dissolved minerals will damage or kill the plant
• The growing medium should never be allowed to dry out completely

Soil / Growing Medium:
• Requires nutrient-poor, acidic, well-draining yet moisture-retentive medium
• Recommended mix: 1:1 peat moss and perlite, or pure sphagnum peat moss
• Never use regular potting soil, compost, or fertilizer — added nutrients will harm the plant

Humidity:
• Tolerates a wide range of humidity levels (40–80%), though higher humidity promotes larger, more robust tentacles
• More forgiving of low humidity than many tropical carnivorous plants

Temperature:
• Optimal range: 10–30°C
• Can tolerate brief periods of light frost but is not frost-hardy; best grown indoors or in a greenhouse in temperate climates
• In its native habitat, it experiences warm, wet summers and cooler, moist winters

Feeding:
• Does not require manual feeding if grown outdoors or near open windows — it will catch its own prey
• If grown indoors without access to insects, occasional feeding with small insects or rehydrated freeze-dried bloodworms (fish food) can supplement nutrition
• Never feed meat, cheese, or other non-insect matter — this will cause leaf rot

Propagation:
• Easily propagated by seed (germinates in 2–4 weeks on moist peat)
• Leaf cuttings: place a healthy leaf on moist sphagnum moss; plantlets will emerge from the tentacles within weeks
• Root cuttings and crown division are also effective

Common Problems:
• Blackening of older leaves — natural senescence; trim dead leaves to prevent mold
• Leggy, elongated growth — insufficient light
• Failure to produce mucilage — low humidity, poor light, or mineral contamination in water
• Fungal infection — caused by poor air circulation or organic debris trapped in the rosette; improve ventilation and remove dead material