Cold-Hardy Sundew Care
Cold-Hardy Sundew Care
No terrariums. No myths. No nonsense.
Where to GrowCold hardy sundews grow best outdoors as a container or potted plant on a sunny deck or patio. You may also grow them in a pond or fountain, but keep the crown of the plants above water. Because of their specific soil requirements, avoid planting them directly into the ground.
SunlightDuring the growing season, grow cold-hardy sundews outside in partial to full sun. Provide 4 or more hours of direct sunlight for vigorous growth.
Heat ToleranceMost cold hardy sundews, such as Drosera filiformis, Drosera intermedia, and Drosera trayci, tolerate the summer heat well. They originate from an area where temperatures above 90°F (32°C) commonly occur in summer. Other sundews, such as Drosera rotundifolia, prefer mild temperatures.
WaterSundews require mineral-free water. If your tap water is relatively pure (less than 50 parts per million in dissolved minerals), then you can safely water your sundews with it. Otherwise, use bottled distilled water. Keep the soil wet at all times. You can do this by setting the plant in small amounts of standing water, no more than halfway up the pot.
SoilUse a soil mixture of 1 part peat moss and 1 part perlite. Never use potting soil, compost or fertilizer; these ingredients will kill your plant.
Winter CareCold hardy sundews require 3-4 months of winter dormancy triggered by cold temperatures (below 50°F or 10°C) and shorter daylight hours. As your plants enter dormancy, they will drop their leaves and stop growing altogether. While dormant, your plant can withstand overnight frosts down to 20°F (-7°C). As long as temperatures rise above freezing during the day, you don't need to protect your plants. However, even while dormant, your plant will still need to sit in a small amount of standing water to prevent its soil from drying out.
If you live in zones 7 and 8, protect your plants prior to the onset of an Arctic front, so pay attention to weather alerts. Shelter your plants from freezing wind by covering them with a tarp or bringing them into an unheated enclosure. Resume normal outdoor care when the Arctic front passes.
If you live in zones 6 or colder, areas where the temperature routinely drops below freezing for more than a week at a time, you will need to mulch your container plants for the winter. Maintain soil moisture whenever the temperature rises above freezing. Uncover your plants in early spring.
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