Colleen, Considering the geographic and elevational range of Milkmaids it should be at least as hardy as most cismontane brodiaeas. It grows in shady places in woodlands or on rocky slopes. I have only grown it incidentally and it seems to benefit from some soil moisture while formant. The "tubers" are rather deep (5-6" or more down). It is quite beautiful and unaccountably scarce in cultivation. Dylan