No I haven't tried bottiom heat, Mike. With summertime temperatures in the 90's and 100's, and nighttime temperatures in the upper 70's and often 80's, I never considered using a heating pad to elevate the temperature. Also, I don't know how I could apply any heat to air-layering, since I no longer try to root fiddleleaf cuttings. Rooting fiddleleafs is just different than rooting plumerias.
