Jim Waddick wrote, "You are destroying my illusions of fields of Dutch Iris growing in the Pacific NW. I understood that this was at one time a major growing area for Dutch Iris (among others)." I expect they were grown along the southern Oregon coast, where Lilium longiflorum (Easter lily) is also a major crop. It is much warmer there in winter. Cutflower producers also grow a lot of them in poly hoop houses. > "What's an Iberian bulb doing flourishing in Holland?" Presumably they lift them, as they do most everything, store them in climate-controlled warehouses, and plant them late in fall or in winter so that they don't make top growth and freeze out. That said, Dutch irises do get through the warmer winters here, such as the past two or three. Jane McGary Northwestern Oregon, USA