The following was received via email: An acquaintance saw in your display gardens an albizia hardy to the Pacific Northwest. Can you please tell what you have that is hardy for you? Thanks very much.
Albizia julibrissin would be the plant your acquaintance observed. This particular plant was collected from seed in South Korea. The "Index of Garden Plants" lists it as zone 7, so it should be hardy throughout much of the coastal Pacific Northwest.