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