How heat tolerant is D. filiformis ssp. filiformis? I aquired one last fall, and it survived through the winter, bloomed and produced many leaves in the spring, but now appears to be doing poorly. I live in the DC area, and we have been having some very hot weeks with temps up into the 80s and 90s. I have it in an undrained window box in a mix of peat moss and sand. There is also a D. dichotoma living in the same pot too. Since D. filiformis ssp. filiformis is a northern plant, could the heat be the problem? I do have photos, but I will have to post them up tommorrow.