Can Drosera regia be successfully grown in the extreme desert climate of Las Vegas?
It certainly appears D. regia can handle the desert southwest with a minimum of fuss as long as sufficient overnight cooling is provided during the hottest months. A larger temperature drop during the cooling period seems to help regia deal with extreme heat during the day (the fridge is set at 55F).
The plant does not appear to be significantly affected by low humidity. It has continued to grow vigorously and produces ample dew. In my growing conditions, growth and dew production appear to correlate more to temperature and/or sunlight exposure than to humidity.
In Las Vegas, regia's temperature ceiling for window sill culture in a room that is not climate controlled appears to be reached when outside temps approach 110F. (I never tested the temperature at the window sill on such days, but it was certainly higher than the 95F - 100F the thermostat in the corridor was showing.) At that point, the plant needs to be placed in a cooler room. Regia does not appear to want lots of sunlight exposure when temps soar. In fact, when summer temps exceed 95F, I strongly suspect it would do fine in only moderate to bright shade in my growing conditions. D. regia has proven to be much more resilient than I thought it would be.
With summer waning, the remainder of the year should be a breeze for regia to handle. Next year, it will spend the entire summer back in the kitchen. No more heat tolerance experiments. Looks like this story might have a happy ending after all.
(Sorry about the 3-part post. For some reason, the system would not allow me to submit this as a single post.)