How to Grow Sundews (Drosera) | Cultivation Techniques to Enjoy the Beauty of Sticky Tentacles

What Are Sundews?

Sundews (genus Drosera) are carnivorous plants with over 200 species native to wetlands worldwide. Their leaves are covered with countless glandular hairs that secrete a glistening, sticky mucilage from their tips. This mucilage traps insects, which the plant then digests and absorbs for nutrition.

In Japan, native species can be found in high-altitude wetlands from Hokkaido to Kyushu. As cultivated varieties, however, species from Africa and South America are more commonly available. They offer remarkable diversity—some with entirely red-tinged foliage, others large and dramatic, still others spreading in beautiful rosette patterns—making them highly ornamental. Among carnivorous plants, sundews are relatively easy to grow, which is why they are popular with beginners. Before starting cultivation, reviewing the carnivorous plant encyclopedia will help you understand the differences between species and choose one that suits you.

Basic Care: Light, Water, and Soil

Light

Sundews love bright light. When grown outdoors from spring through autumn with direct sunlight, their leaves turn a vivid red and mucilage secretion becomes vigorous. Indoors, a south-facing windowsill is ideal, though LED grow lights work well too. Insufficient light will cause pale foliage and reduced mucilage production. If you want to refine your lighting setup further, the carnivorous plant sunlight and lighting guide is worth consulting.

Watering

The fundamental technique for carnivorous plants is "water-tray management." Keep 2–3 cm of water constantly in a saucer beneath the pot, ensuring the soil remains consistently moist. Calcium and magnesium in tap water accumulate and damage roots, so rainwater, distilled water, or reverse-osmosis (RO) water is recommended. Collecting rainwater is the most cost-effective approach. For detailed guidance on water quality decisions, see carnivorous plant water quality management: when to use distilled water, rainwater, and tap water.

Soil

Sundews require low-nutrient growing media. Standard potting soil or leaf mold contain too much fertilizer and will damage roots. Sphagnum moss alone, or sphagnum and perlite in equal parts, are the standard mixes. Single-ingredient Kanuma soil or peat moss mixed 1:1 with perlite are also widely used. All must be completely fertilizer-free.

Temperature Management and Seasonal Care

Growth Period (Spring to Autumn)

The ideal temperature range is 15–30°C, when growth is most vigorous. Summer's high heat and humidity stimulate active growth, but watch for rot. Avoid managing plants in sealed containers; provide adequate airflow. When temperatures exceed 35°C in peak summer, lightly shade from direct sun to prevent leaf scorch.

Dormancy Period (Late Autumn to Winter)

Temperate species (such as Drosera tokaiensis, the native sundew) have their aboveground parts die back and enter dormancy. During this period, reduce watering and keep plants in a refrigerator (around 5°C) or in a frost-free outdoor location. As temperatures warm in spring, new shoots emerge and active growth resumes.

Tropical species (Drosera capensis and Drosera adelae, among others) do not require dormancy and can be maintained year-round indoors. For beginners, these tropical varieties are more manageable.

Representative Species and Characteristics

Drosera capensis (Cape Sundew)

Native to South Africa. Slender leaves radiate outward with striking red mucilage. Extremely hardy with vigorous reproduction; readily sets seed and can self-sow. An ideal first specimen.

Drosera binata (Fork-Leaf Sundew)

Distinctive Y-shaped or multi-branching leaves; becomes quite large. Produces powerful sticky tentacles capable of trapping large insects. As the plant outgrows its pot quickly, using a slightly deeper container makes management easier.

Drosera tokaiensis (Tokai Sundew)

Drosera tokaiensis is a subtropical hybrid (D. tokaiensis × D. comosus) that does not fully enter dormancy in winter and remains evergreen. Though it tolerates light frost, maintaining temperatures above 5°C and allowing year-round growth is appropriate. For conservation reasons, please confirm any purchase is a cultivated specimen rather than wild-collected material.

Drosera adelae

An Australian miniature species. The white-to-pale-green leaves and translucent mucilage are beautiful. It tolerates relatively low light and is well-suited to terrarium cultivation.

Propagation: Leaf Cuttings, Division, and Seed

Leaf Cuttings

The easiest propagation method. Gently detach a healthy leaf at its base and place it horizontally on moist sphagnum or growing medium. Within weeks, small plantlets will emerge from the leaf base. Drosera capensis has a high success rate and is ideal for first attempts. For more detailed procedures by species, consult the carnivorous plant propagation guide.

Division

Vigorous specimens often develop multiple growth points. At repotting time, separate the plant along these points and pot each division individually.

Seed Sowing

Many species self-pollinate readily; sow collected seeds on moist sphagnum and they will germinate. Although it takes longer to reach maturity than other methods, you obtain many plants at once. Seeds are sensitive to drying, so sow immediately after collection or store in the refrigerator.

Troubleshooting and Cautions

No Mucilage Production

The cause is usually insufficient light or deteriorating water quality. First, reassess the plant's location and move it to a brighter spot. If you have been using tap water, switch to rainwater or distilled water. Fertilizer is unnecessary and actually harmful.

Yellowing or Rotting Leaves

Often caused by poor airflow and overwatering. Improve ventilation and change stagnant water in the tray. If root rot is underway, remove damaged roots and leaves, and repot in fresh medium.

Pest Management

Aphids and spider mites can infest the plant. Because strong pesticides cannot be used on carnivorous plants, hand-removal is the first step. If that fails, use a natural-ingredient insecticide spray at low concentration. Since pesticide tolerance varies by species, test on a small area before treating the whole plant.

Sundews reward you with their delicate beauty when given the right light and water. There is a unique, meditative quality in watching those glistening tentacles at work. Begin with hardy tropical varieties, and as your confidence grows, expand your collection to include native Japanese species or rare cultivars.

Find Sundews on botachoku

On botachoku, you can purchase various Drosera varieties directly from growers who specialize in carnivorous plants. The direct-sales model lets you check plant condition and growing environment on each listing before you buy—a major advantage. If you are looking for easy-to-grow varieties, browse the carnivorous plant category to see what is available.