TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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I cant speak for Drosophyllum which I do not grow. Dew on sundews is not dew. It is mucilage. The drops will normally not dry off a healthy plant that gets around 40% humidity even if the humidity drops still further(although there are exceptions). The largest factor affecting dew production in my estimation is light. These plants require as much light as cacti for typical growth, form and color. I have had plants in nearly dry mediums with dew present.
To learn more about general sundew cultivation from my perspective, please check out this post which I have just topped off.