Drosera affinis is a captivating carnivorous plant from the Drosera genus. Known for its unique appearance and relatively straightforward cultivation, this sundew is a rewarding specimen for enthusiasts.
Identifying Drosera Affinis
Drosera affinis is a subtropical sundew originating from subtropical Africa. As it matures, it develops a slender stem up to 25 cm long, forming an erect, palm-like appearance. Its leaves have long, thin petioles and paddle-shaped blades.
The plant’s coloration can vary; leaves typically appear green, but under intense light, they transform into a brilliant orange-red or crimson hue. Its sticky tentacles are covered in glistening, orange-red droplets that attract and trap small insects. It forms a loose rosette of erect to semi-erect leaves at the stem’s apex. Its long, slender roots require a sufficiently deep pot.
Caring for Drosera Affinis
Light Requirements
Drosera affinis thrives in bright light conditions, ideally full sun. Strong light encourages vibrant coloration, turning the plant a striking red, and promotes abundant dew production. Indoors, provide a 16-hour photoperiod under strong grow lights. Signs of adequate light include red tentacles, compact growth, and strong dew production.
Substrate Needs
The substrate for Drosera affinis must be nutrient-poor and acidic. A common mix is a 1:1 ratio of peat moss and horticultural silica sand, or long-fibered sphagnum moss. Small amounts of perlite can be added to improve aeration and drainage. Rinse media thoroughly before use to remove impurities. The substrate should be kept consistently moist.
Watering Principles
Consistent moisture is crucial for Drosera affinis, and the “tray method” is highly recommended. This involves placing the pot in a saucer with 3-4 cm (1-1.5 inches) of water, allowing the plant to absorb water from the bottom. Only distilled water, rainwater, or reverse osmosis (RO) water should be used. Tap water contains minerals that can harm the plant’s sensitive root system. The tray should always contain water, though brief drying before refilling is acceptable.
Temperature and Humidity
Drosera affinis is a subtropical sundew from subtropical Africa, adapting to a broad temperature range. It generally thrives in temperatures between 13°C and 35°C (55-95°F). While it can tolerate short dips below 5°C or above 35°C, protection from frost is necessary. It does not require dormancy and can be grown year-round. Humidity requirements are not high, but 30-40% relative humidity is beneficial, and good airflow is important to prevent fungal issues.
Feeding Practices
Drosera affinis naturally captures small flying insects using its sticky tentacles. Supplemental feeding encourages faster growth and flower production, especially indoors where natural prey is scarce. Small to medium-sized insects, such as springtails, gnats, or fruit flies, are suitable. Feeding once every two weeks is generally sufficient. Never use fertilizers or general plant food, as these are toxic to carnivorous plants.
Propagating Drosera Affinis
Drosera affinis can be propagated through seeds, leaf cuttings, and root cuttings. Seed propagation is straightforward; cold stratification is not typically required. Sow seeds on a moist, peat-based media, keeping them warm with good light. Germination usually occurs within weeks. Plants grown from seed can reach flowering maturity in about 1 to 1.5 years with consistent feeding.
Place healthy leaves on a moist growing medium in a high-humidity environment; new plantlets form in about four weeks. Root cuttings are also viable. Gently split thicker roots and plant them horizontally in moist substrate, either partially buried or about a half-inch below. Divisions are also possible as the plant forms clumps. Drosera affinis tolerates repotting and root disturbance well.
Addressing Common Issues
A common issue is a lack of dew production, indicating insufficient light or humidity. Increasing light intensity and ensuring adequate humidity (above 30%) can help restore dew. Browning leaves or stunted growth often stem from incorrect watering, such as using tap water with high mineral content. Switching to distilled, rainwater, or RO water is essential to prevent mineral buildup and plant decline.
While generally robust, Drosera affinis can occasionally face pest infestations. General carnivorous plant pests like aphids or mealybugs might occur. Good air circulation helps prevent fungal issues in overly humid or stagnant environments. If plants decline despite proper care, propagation through cuttings can save genetic material and produce new plants.