Drosera — Sundew Cultivation Guide

Temperate vs. tropical — not interchangeable

Drosera divides cleanly into two cultivation categories. Getting them mixed up is the most common mistake new growers make with this genus.

Temperate sundews — primarily D. rotundifolia, D. intermedia, D. linearis, and D. anglica — are native to northern bog habitats and require a cold winter dormancy exactly like Sarracenia. They are fully Zone 6 outdoor capable, go dormant in fall as hibernacula (tight winter resting buds), and re-emerge in spring. Treat them identically to Sarracenia in terms of culture: full sun, tray water, nutrient-free acidic media, cold dormancy.

Tropical sundews — the majority of the genus including the popular D. capensis, D. aliciae, D. spatulata, and the spectacular fork-leaved species — require consistent warmth and do not go dormant. They grow year-round given adequate light and humidity. In Zone 6 they are indoor plants or warm-season patio plants that must come inside well before frost.

A third group — pygmy sundews from Australia — are cool-season growers that produce gemmae (vegetative propagules) in late fall and summer dormant. They require their own specific management and are covered under the species profiles below.

Key species by cultivation group

A representative selection across the major Drosera cultivation categories. These are the species most relevant to Zone 6 and cold-climate growers.

D. rotundifoliaRound-Leaved Sundew

Hardy to Zone 3Outdoor Zone 6Dormancy Required

The quintessential northern sundew — circumpolar in distribution, native to bogs across North America, Europe, and Asia. Small rosette-forming plant with round paddle-shaped leaves covered in red glandular tentacles. Goes dormant as a tight hibernaculum in fall, re-emerges in spring.

Fully outdoor-capable in Zone 6. Grow alongside Sarracenia in the same tray system. One of the most satisfying carnivorous plants to grow in a cold climate — it belongs here as much as anywhere.

D. intermediaIntermediate Sundew

Hardy to Zone 4Outdoor Zone 6Dormancy Required

Slightly larger than D. rotundifolia with elongated spatulate leaves. Often found in wetter microhabitats than rotundifolia — tolerates standing water more readily. Two ecotypes: a northern temperate form that is cold-hardy and a tropical form from the American Southeast that is not. Confirm you have the temperate form before growing outdoors.

D. capensisCape Sundew

Tropical

The most commonly grown tropical sundew and the best starting point for indoor culture. Native to South Africa — produces long strap-shaped leaves covered in red tentacles. Self-seeds prolifically, which means one plant quickly becomes a colony. No dormancy required. Tolerates lower humidity than most carnivorous plants. Move outdoors in summer, bring inside before first frost.

D. aliciaeAlice Sundew

Tropical

South African species forming flat, compact rosettes with wedge-shaped leaves densely covered in glands. Slightly more compact than D. capensis. A tidy, attractive plant that does well on a sunny windowsill year-round. No dormancy. Same culture as capensis — one of the easier tropical sundews for Zone 6 indoor growing.

D. binataFork-Leaved Sundew

Tropical

Produces dramatically forked or multi-divided leaves reaching 12–18 inches in mature plants. Several forms including a fine-leaved multifida variety and a large dichotoma form. Tropical but remarkably vigorous given adequate sun. The most visually dramatic sundew for a windowsill or outdoor summer display.

D. scorpioidesPygmy Sundew

Pygmy

Representative of the Australian pygmy sundews — tiny rosettes rarely exceeding an inch in diameter. Produces gemmae (small vegetative propagules) in fall that can be used for propagation. Summer dormant — growth slows significantly in high summer heat, resumes in cooler fall temperatures. A specialized group worth exploring once basic Drosera culture is mastered.

Consistent principles across a diverse genus

Media and the tray method

All Drosera — temperate and tropical — share the same media requirements: nutrient-free, acidic, moisture-retentive. The standard formulation of sphagnum peat and perlite at a 1:1 ratio works for the vast majority of species. Some growers use pure long-fiber sphagnum for tropical species with excellent results.

Tray watering is the correct method for most Drosera. Temperate species in tray culture match their natural bog conditions precisely. Tropical species in trays stay consistently moist without requiring daily monitoring. Keep the tray at ½ to 1 inch of pure water depth. Never use tap water.

Light

Drosera needs significant light to produce the gland density and coloration that indicates a healthy, actively trapping plant. Tentacles that are green rather than red, leaves that are pale or limp, and minimal mucilage production are all signs of insufficient light. Move to a sunnier position first before adjusting any other variable.

Temperate Drosera in outdoor culture alongside Sarracenia receive the same full-sun conditions and thrive. Tropical Drosera indoors do best in the brightest available window — a south-facing sill in Zone 6 with 5–6 hours of direct winter sun is adequate for most species. Supplemental LED lighting extends the productive season and improves gland production significantly.

Dormancy — temperate species only

Temperate Drosera enter dormancy in fall as the plants contract into hibernacula — tight, bud-like resting structures at the soil surface. This is normal. Do not attempt to prevent it or interpret it as plant death. Leave the hibernacula in their tray, keep the media consistently moist through winter at a reduced tray level, and they will re-emerge in spring.

Tropical Drosera do not form hibernacula and do not require or tolerate a cold dormancy. Keep them warm year-round. The pygmy sundews have a different summer dormancy pattern — slow or cease growth in summer heat and resume actively in fall.

Propagation

Drosera propagates readily by leaf cuttings, root cuttings, and seed. D. capensis and many tropical species self-seed so aggressively that propagation is rarely a concern — containment is more often the issue. Temperate species can be propagated by carefully removing hibernacula offsets in early spring before the growing season begins. Pygmy sundews produce gemmae in fall that germinate readily when placed on moist media surface.

Growing temperate Drosera in Zone 6

Grow alongside Sarracenia in the same tray system
Same media, same water, same light requirements
Outdoor April through October — bring in or leave for dormancy
Hibernacula formation in fall is normal — do not disturb
Keep tray moist through dormancy — never dry
Re-emergence in March–April alongside Sarracenia new growth

Troubleshooting sundews

No mucilage — insufficient light, move to full sun immediately
Green tentacles, no red — same cause as above
Black leaves — tap water damage or nutrient burn, repot in fresh media
Flat, limp growth — usually light, sometimes insufficient humidity for tropical species
Not re-emerging from hibernacula — check for dry media during dormancy
Leggy upright growth — reaching for light, increase light source intensity