Jamie: Funny I wish I had your climate to grow other things. Its all about that forbidden fruit thing I guess. I grow all the arisaemas in normal garden soil except I usually add a couple of hands full of grit as I plant them. I get them from Seneca Hill Perennials in upstate New York. Ellen Hornig is a real careful small scale nursery owner that takes time and stands behind whatever she wells. The grit is somewhat like aquarium gravel. I think that some gardeners use chicken grit which is available at feed stores. I did have an episode of root mealy bugs which caused one of my tubers to die back. Luckily I was able to save them by digging them up and treating with a insecticide. Why are you over wintering in the garage? They are hardy here and we get down to 10 to 15 F routinely. I live ten minutes outside of NYC and we get wet winters and actually this spring and summer were the wettest on record. If you want some of the seeds of the tortuosum let me know and send and address. I was going to send them to the SX/BX for distribution to the group. Arnold