I agree that it's likely temperature. These normally germinate in the Sonoran spring thunderstorms, when the daytime highs are between 90 and 100 F (32 to 38 C) Steve "You can easily judge the character of a person by how he treats those who can do nothing for him or to him." Malcolm Forbes Drop by and see me at : http://www.geocities.com/HotSprings/Spa/6811