Drosera adelae
General
Drosera adelae, also known as the lance-leaved sundew, is a fascinating carnivorous plant native to the rainforests of northeastern Australia. It stands out for its elegant, elongated leaves glistening with sticky mucilage, used to trap insects. This sundew's ease of care and adaptability to indoor conditions make it a favorite among carnivorous plant hobbyists.
Physical Characteristics
This species showcases graceful, lance-shaped leaves that typically grow 10–20 cm (4–8 inches) long and 1–2 cm (0.5–1 inch) wide. Each leaf is covered with rows of delicate, red-tipped glandular hairs that secrete sticky droplets. These shimmering drops not only attract prey but also act as a deadly adhesive. The plant forms low ground-hugging rosettes and, under optimal conditions, sends up arching stems with small, star-shaped reddish flowers.
Lifestyle
An active hunter, this sundew relies primarily on its leaves. Small insects, lured by the sparkling mucilage, become ensnared. The leaf hairs then gently curl around the prey, allowing the plant to secrete digestive enzymes and absorb vital nutrients. This carnivory supplements its diet in its naturally nutrient-poor soils.
Habitat and Protection
Its natural home is the humid understory of Queensland’s coastal rainforests, often near shaded creeks and seeps. Here, it experiences dappled sunlight, constant moisture, and mild temperatures. Although not considered globally threatened, its habitat is sensitive, and loss of rainforest cover poses a future risk. Responsible cultivation can help ensure the survival of this unique species.
Cultivation
This sundew is well suited for terrariums and indoor growing, thanks to its love for diffuse light and high humidity. It spreads through root offshoots and readily adapts to stable conditions. While not difficult to grow, it thrives when its environment closely mimics its rainforest origins—think consistently damp soil, gentle light, and warmth.
Special Features
One of its most delightful qualities is the constant sparkling appearance of its mucilage drops, giving the impression of dewdrops frozen in time. Unlike some sundews, it rarely enters dormancy and often produces “pups” from its roots, leading to attractive colonies. Its size, manageable growth pattern, and forgiving nature make it an excellent ambassador for carnivorous plants.
Care
Light
Provide bright, indirect light. East-facing windows or filtered sunlight under grow lights are ideal. Too much direct sun can scorch the delicate leaves, while too little results in weak, green growth and reduced mucus secretion.
Temperature
Prefers a temperature range between 18–28°C (65–82°F). It tolerates slight drops at night but is sensitive to cold drafts and low temperatures.
Water
Keep the soil consistently moist. Use the tray method: sit the pot in a few centimeters of distilled or rainwater. Never let the medium dry out, but avoid constant flooding.
Soil
Requires a low-nutrient, acidic mix—commonly 1:1 sphagnum peat moss and perlite. Avoid commercial soils with fertilizers or additives.
Nutrition
Relies on regular insect capture. No fertilizer is needed. Occasional feeding with small insects (never mammalian/meaty foods!) helps support vigorous growth, especially indoors.
Humidity
Thrives in high humidity—above 60%. Enclosed terrariums, pebble trays, or frequent misting will help, especially in dry climates.
Dormancy
Generally does not require or experience dormancy under typical indoor conditions. Growth may slow in winter due to reduced light, but it should remain evergreen.
Common Problems
Leaves discolor or burn
Cause: Too much direct sunlight without gradual acclimatization.
Solution: Allow the plant to gradually get used to brighter light by slowly increasing its exposure to direct sunlight.
Brown leaf edges
Cause: Hard tap water or excessive fertilizer concentration.
Solution: Use only soft (rain/demineralized) water and do not use chemical fertilizer.
Lack of dew on leaves
Cause: Low humidity or insufficient light.
Solution: Increase ambient humidity and ensure the plant is receiving enough indirect light.
Pale or weak leaves, no growth
Cause: Too little light or poor soil drainage.
Solution: Move to a brighter spot (without intense sun) and ensure the soil is loose and draining well.
Root rot
Cause: Constant waterlogging without adequate air circulation.
Solution: Use a well-aerated soil mix and avoid submerged pots for long periods.