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Hi Marcy, I talked to someone who grows this perennial in zone 4, she said it barely survives their winters, but feels it should do O.K. in zone 5, (zone 5 is warmer than 4.) She thought Johnny's Seeds carried the seed, but I checked my catalog and couldn't find them. You could send them an email at www.johnnyseeds.com and ask them if they have some tucked away somewhere. Hope this helps, Diane |