Investigate Problem

What is wrong with my sundew?

Sundews (Drosera) are herbaceous perennial (or rarely annual) plants that grow in prostrate or erect rosettes ranging in height from 1 to 100 cm (0.39 to 39.37 in), depending on the species. Climbing species produce stems that can grow to be 3 m (9.8 ft) long. Sundews have been demonstrated to have a lifespan of up to 50 years. Because of its carnivorous habit, the genus is specialized for nutrition intake.

Find out how to care for your sundew.

proposes Are the flowers covered with gray mold, leaves may be blotched or discolored?

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Most common questions used to investigate

Are the flowers covered with gray mold, leaves may be blotched or discolored?

Are the leaves curled and distorted?

Does your sundew have no dew?

Do you grow your sundew plant in full sun?

Do you grow your sundew in high temperature?

Are the leaves covered with small bumps?

Common conclusions

Gray mold on flowers is probably caused by fungal disease - Botrytis blight. Remove dead foliage regularly, provide plenty of air movement around the plant, especially in still, damp weather in March, April as the plants come back into growth. Spray with a fungicide if necessary. If botrytis is found, cut out the infected area with a sharp knife and dispose of all infected plant waste. Remove petals from old flowers.

Distorted and curled leaves are caused by aphids. These tiny insects cluster under leaves and on growing tips where they feed on plant sap. With small plants like Sundews, the aphids can overwinter in the plant and do a lot of damage before the leaves come up. A systemic insecticide is the best way to deal with them or submerge the whole plant for a couple of days. Soft soap is another organic method of dealing with them.

If you're growing sundews outdoors, intense light will cause higher transpiration/stress, which can end up causing your sundew to produce little or no dew during the hottest, brightest part of the day. If this is the case, you should move your sundews to a shadier location. If growing sundews under lights indoors, you can reduce transpiration stress by moving the lights further above the plants, reducing the temp, or increasing humidity.

Temperature can affect dew production because sundews can decrease or increase the amount of water they pump out through the tentacles depending on how much temperature stress there is. Higher temperatures increase transpiration, which causes the dew to evaporate more quickly. This is important for certain sundews like D. regia, South American sundews, or schizandra, which prefer cooler temperatures to produce the largest amounts of dew.

Humidity is known to provide "superficial dew" that will disappear if the plant is removed from its humid environment. Humidity is important because it decreases transpiration/water loss, allowing dew droplets to be larger. While humidity is not as important if there is no air movement, humidity can be very beneficial in higher temperatures, bright sunlight, or when there is a lot of wind. Humidity can be increased by using a small humidifier or the tray method.

Leaves covered by small bumps are caused by scales. These tiny, shelled insects cause an unhealthy appearance with yellowish blotches on the upper leaf surfaces. Scrape off minor infestations with your fingernail. Prune out badly infested growth, or use a soft brush and soapy water to gently scrub the scales off the stems. Control scales by spraying insecticidal oil during the growing season.

White, cottony clusters on leaves and stems are caused by mealybugs. These tiny insects are covered with a fluffy white coating. They feed by sucking plants sap. They produce the sticky substance honeydew which makes leaves sticky. Spray a systemic insecticide, or dab each insect with a paintbrush dipped in methylated spirits or alcohol.

References

https://www.chineseherbshealing.com/carnivorous-plants-5/pests-and-diseases.html
https://www.littleshopofhorrors.co.uk/pests-diseases
https://www.rhs.org.uk/advice/profile?pid=819
http://www.growsundews.com/sundews/Sundew_Problems_Page-Drosera_help_recovery_and_care.html

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Sreten null
Hi! I’m Sreten Filipović. I graduated from the Faculty of Agriculture at the University of Belgrade, with a master's degree in Environmental Protection in Agricultural Systems. I’ve worked as a researcher at Finland's Natural Resources Institute (LUKE) on a project aimed at adapting south-western Finland to drought episodes. I founded a consulting agency in the field of environment and agriculture to help farmers who want to implement the principles of sustainability on their farms. I’m also a founding member of the nonprofit organization Ecogenesis from Belgrade whose main goal is non-formal education on the environment and ecology. In my spare time, I like to write blog posts about sustainability, the environment, animal farming, horticulture, and plant protection. I’ve also published several science-fiction short stories. You can find me on LinkedIn at https://www.linkedin.com/in/sreten-filipovi%C4%87-515aa5158/