Carolyn: I'm not sure about the thermogenic qualities of Galanthus. I did aim an infra-red camera on a Arum paleaestinum and the spadix showed a higher temp than the surrounding area. The image is on Wiki Wiki. The theory for the Arum is that it mimics decaying meat and helps attract pollinators. If you know anyone with an infra-red camera it might be a good idea to give it a try. Arnold Feb 6, 2011 10:13:39 AM, pbs@lists.ibiblio.org wrote: There are a lot of statements out there that snowdrops are thermogenic, i.e., produce their own heat. I have observed this in my gardens. However, the scientific literature I have found on the subject does not list snowdrops or their family among thermogenic plants and families. Doe anyone know if they are and could you provide a source for the information. Thanks. Carolyn Walker Carolyn's Shade Gardens http://www.carolynsshadegardens.com/ carolynsshadegardens@verizon.net 325 S Roberts Rd Bryn Mawr, PA 19010