Roundleaf Sundew Care (Drosera rotundifolia)

This species needs strong light to form healthy red traps and sticky dew.

• Provide 6–10 hours of direct sun daily; full sun in cool to mild climates gives compact growth and intense coloration in Roundleaf Sundew.
• In hot summers, favor morning sun with light afternoon shade, or filtered light after 2–3 p.m., to reduce leaf scorching and drying of the bog substrate.
• In winter, shorter days slow growth; plants can tolerate low sun angles but should still receive several hours of unobstructed light to prevent weak, pale leaves.

This bog species requires constantly wet, low-mineral conditions.

• Keep the soil saturated; do not allow the surface to dry more than 1–2 mm, and avoid fast-draining, coarse mixes that cannot hold a standing water layer.
• Use only rainwater, distilled, or reverse-osmosis water; mineral-rich tap water causes leaf burn, weak dew production, and eventual root decline.
• In cooler seasons, maintain moist to wet conditions with a slightly lower water level; in warm periods, increase water depth and watch for wilting, crisped tips, or gray, sour-smelling soil as stress signs.

This temperate carnivorous plant is adapted to cool summers and cold, dormant winters.

• For active growth, aim for 60–77°F (16–25°C); brief highs up to 86°F (30°C) are tolerated if the soil stays cool and wet and humidity is moderate.
• It withstands winter lows near 23°F (−5°C) in dormancy, and established plants can survive short freezes if the roots remain insulated in saturated peat.
• Avoid prolonged extremes above 90°F (32°C) or below 20°F (−7°C), which can damage foliage or crowns, especially in exposed, shallow bog setups.

This carnivorous bog species needs consistently high humidity to keep traps functional and leaves hydrated.

• Aim for 60–90% humidity, mimicking cool bog conditions for Roundleaf Sundew growth.
• Leaves curling inward, dull tentacles, and reduced dew indicate humidity stress.
• Use a water tray near the pot, group plants, or place in a covered tank with vents for air movement.

This species requires a nutrient-poor, acidic, water-retentive but airy substrate similar to natural peat bogs.

• Use a mix of 1:1 sphagnum peat moss and silica sand or perlite to create a light, fibrous medium.
• Ensure soil stays consistently moist but not stagnant; the mix should hold water yet feel springy, not compacted.
• Target an acidic pH around 4.0–5.5 and avoid lime, fertilizer, compost, and manured products that burn roots.
• Gently fluff the top layer occasionally to maintain aeration and prevent the peat from forming a dense crust detrimental to Drosera rotundifolia.

This carnivorous species is well suited to container growing when moisture and stability are controlled carefully.

• Choose tall, relatively narrow pots to provide a deep, cool, saturated zone for the fine root system.
• Use plastic or glazed ceramic containers to slow evaporation and keep the soil evenly wet for longer periods.
• Set the pot in a shallow standing-water tray so only the lower portion of the mix wicks water, preventing complete waterlogging.

This carnivorous bog species receives most nutrients from captured insects and should not be conventionally fertilized.

Pruning Drosera rotundifolia is minimal and focuses on hygiene rather than shaping.

• Cut dead or blackened leaves at the base using fine scissors to reduce mold and fungal growth.
• Remove spent flower stalks after seed set if stronger rosette growth is preferred over self-seeding.
• Avoid trimming healthy dewy leaves, as this reduces the plant’s ability to capture prey and gain nutrients.

Container-grown roundleaf sundew benefits from infrequent, careful repotting to maintain suitable acidic, low-nutrient conditions.

• Repot every 2–3 years or when roots fill the pot, growth stalls, or peat-sand mix compacts heavily.
• Best timing is early spring before strong new growth begins, to limit disturbance stress.
• Use a plastic pot with drainage and fresh 1:1 sphagnum peat and silica sand; avoid fertilizers or compost.
• Water the plant well, then gently ease out the root ball, disturb roots as little as possible, and keep medium evenly moist afterward.

Drosera rotundifolia is commonly propagated by seed and leaf cuttings under consistently moist, bright conditions.

• Collect ripe seed in late summer and surface-sow on wet sphagnum peat-sand mix without covering, as seeds need light to germinate.
• Provide cool stratification at 35–45°F for 4–6 weeks to break dormancy, then move to bright, cool conditions for germination.
• For leaf cuttings, place healthy leaves on waterlogged peat-sand or in shallow distilled water, ensuring good light but no direct scorching sun.
• Maintain high humidity and constant moisture, then separate and pot young plantlets once several true leaves have formed.

This species is cold hardy and enters a natural winter dormancy, needing only modest protection in extreme conditions.

• Dormant hibernacula tolerate freezing and snow if roots remain in saturated but not solidly frozen peat.
• In very cold climates, add a 2–5 cm layer of loose mulch, such as pine needles, around outdoor bog plantings to insulate crowns.
• Move containers into a cold frame, unheated garage, or sheltered porch where temperatures stay roughly 25–40°F to prevent deep pot freeze-through.