I cannot answer that Andrew. So far I have stuck with things which will do well here, at least as far as I know. However, I am trying some seeds which I don't know how they will go. Some Tulipa seed and some Sternbergia seed. With autumn coming I am hoping some of these will germinate. I just sowed them and have kept them watered since I got them. I have not tried chilling anything, although I am going to try it with some seed I collected recently of an Iris, which I have no idea what kind it is, so to make sure, I will sow half in soil and chill half in a damp paper towel for a few weeks. Ina