TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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A little more information would help. Do you know what type of sundew it is? How are you watering it...are you keeping it wet? Are you growing it covered or uncovered? Sundews like high humidity. You can keep it covered with a clear plastic cup or dome or put it in a terrarium or a tank. Once its in the conditions it likes, it will dew up in a few days usually.
I only have one sundew and it is a cape sundew (Drosera Capensis) , I keep the soil damp , I keep it uncovered because the humifier is very powerful , and the plant does'nt seem to be catching bugs since I got it .
Large flies may be too big for smaller sized cape sundews to catch. The leaves may not have a strong enough "glue" to catch the house flies when the plant is outdoors in low humidity. The "glue" on the leaves may have evaporated during the day.