The Cape Sundew (Drosera capensis) is a captivating carnivorous plant, forming a rosette of leaves covered in sticky, dew-like secretions that trap insects. Originating from the wetlands of South Africa, it is favored by enthusiasts for its ease of care and prolific flowering. This plant thrives in nutrient-poor environments by obtaining nutrients from insects.
Understanding the Cape Sundew Flower
The Cape Sundew produces delicate flowers on tall, slender stalks that emerge from the plant’s center. These stalks can reach 6 to 12 inches (15-30 cm), elevating the small, pink to mauve (or white) flowers above the sticky, insect-trapping leaves.
Individual flowers on the stalk open sequentially, one at a time, each lasting a single day. This sequential opening means a single flower stalk can provide blooms over several weeks, from late spring into autumn. Cape Sundews are self-fertile and self-pollinating; the anthers often rub against the stigmas as the flower closes, facilitating this process.
Encouraging Healthy Flowering
To encourage robust flowering, provide optimal environmental conditions. Cape Sundews thrive in bright light, requiring at least six hours of direct sunlight daily. A south-facing window is ideal for indoor cultivation. If natural light is insufficient, full-spectrum grow lights can supplement, providing 12-16 hours of light per day.
As bog plants, Cape Sundews need consistently moist, but not waterlogged, soil. Use distilled, rainwater, or reverse osmosis water, as tap water minerals can harm them. The tray method, where the pot sits in 1-2 inches of pure water, effectively hydrates the soil.
Maintain humidity levels around 40-70% for vigor and fuller flower opening. Average room temperatures of 60-75°F (16-24°C) are suitable for growth and flowering, though optimal blooming temperatures are 68-95°F (20-35°C). Adequate insect intake also contributes to energy reserves for more robust flowering.
Harvesting Seeds and Propagation
After flowering, tiny seed pods develop along the stalk, containing numerous small, black, dust-like seeds. Seeds typically ripen four to five weeks after pollination, turning dark brown and dry when ready for harvest. Wait until the stalk is about 70% brown and pods show signs of splitting to ensure maturity.
To collect seeds, snip the dried flower stalk at its base. Gently shake the stalk over white paper or a container to release the fine seeds. Some growers crush dried flower capsules to ensure all seeds are released. Store these seeds in a dry, cool place, such as a refrigerator, for future propagation.
For propagation, use a nutrient-poor, acidic mix like 50% peat moss and 50% perlite or sand. Sprinkle seeds evenly on the moist medium surface, taking care not to bury them. Keep the soil consistently moist, often by placing the pot in a tray of water. Maintaining temperatures between 75-85°F (24-30°C) and providing bright light will encourage germination, which typically occurs within three to six weeks.
Deciding on Flower Stalk Removal
Growers often remove the Cape Sundew’s flower stalk to conserve the plant’s energy. Producing flowers and seeds is an energy-intensive process; removing the stalk redirects this energy into leaf and root growth, potentially leading to a larger, more vigorous plant. This is particularly beneficial for younger or less established plants.
Conversely, allowing the plant to flower and set seed offers several advantages. Cape Sundews are prolific seed producers, with one stalk yielding hundreds or thousands of seeds. This provides an abundant supply for propagation, allowing growers to expand their collection or share with others. Allowing the natural process also means enjoying the aesthetic appeal of the delicate pink flowers.
If removing the stalk, do so once flowers have faded or seeds are collected. Snip the stalk cleanly at its base, close to the rosette of leaves. This practice helps maintain the plant’s appearance and ensures energy is focused on foliage development if propagation is not desired.