Hi Collen, The Jepson Manual has a range map. http://ucjeps.berkeley.edu/cgi-bin/… This species grows from the coast to the Sierra Nevada so if you can find high elevation form, it probably will be more hardy. I'll have to keep an eye out for seeds, but after all, it is Cardamine and the pods explode. Nhu On Fri, Apr 5, 2013 at 11:39 AM, Colleen <silkie@frontiernet.net> wrote: > Since the tubers grow 5-6 inches down I would think they could withstand > cooler temps, but in researching them I only find mention of their growing > in the milder, coastal locations. I wonder where I might find some to try? >