I so far have only Arisaema consanguineum at flowering size and established in a dryish woodland area in England in what is probably roughly Zone 8. It seems tolerant of fairly dry conditions in shade. I find Arisaemas easy from seed. They germinate quite readily and survive my semi-neglect either out of doors or under the staging in the greenhouse. They seem to take about three years to reach a size where it feels safe to plant them out. Then another year or two to flower. My strongest plant has set seed for the first time this year, six or seven years after the original seed was sown. Janet Galpin, Lincolnshire, UK, Av min temp -7