I have been wondering about this: What effect does temperature have on the viability of seeds? Does it affect all seeds the same? If seeds from tripocal species are subjected to freezing temperatures, do they die? I'm sure this varies from species to species, but I've been hesitant to order seeds to be shipped in winter, for fear that they would die in the mail, since it is so cold here. I have on order some seeds of species native to northen Australia (from cultivated stock in Canada). Should I wait until spring to have them shipped, or would they be okay in this cold? I know that some seed banks store seeds at super cold temperatures, but is this the same cold as what we have here in Manitoba? Btw, I'm not sure if this is the right place to post this, but I couldn't find a more appropriate place, since the General Gardening and Question and Answer forum is closed to me now.