You can't really expect much to survive a winter in a pot unprotected... The hardiness of a plant is based on the assumption it is planted in the ground where it will be insulated by the mass of the earth around it and the snow on top of it when it snows. You would need to bury the pots in the winter or otherwise protect the pots if you expect anything to overwinter in a pot no matter what it's hardiness rating is.

While Sudden Oak Death is still a problem in many areas around the SF Bay Area, it is not spreading/killing indiscriminately in other areas. As an example, there seems to be little damage from this disease in many parts of Berkeley, although it exists here. Trees most at risk appear to be in areas more subject to fog and high winds closer to the coast, as in parts of Marin County and Santa Cruz Counties. I suspect that the trees and fungus are reaching some sort of equilibrium, and California will lose oaks in some areas, but other areas will remain mostly unaffected. It is interesting to note that mortality is even higher for Lithocarpus, and that Umbellularia californica is a carrier species, but is not killed by the fungus. As Umbellularia is so often widespread in combination with Live Oaks in the wild, it compounds the problem in native woodlands. If I had both trees in a garden situation, and the Umbellularia were young, I would remove them as a precautionary measure.

barb yes can you just need to find the small seed quantity importation form filled it out by the American sending you the seed. There is similar form that would need to be filled out if decide to send seed to an American.

Hello! Looking for sedum Caeruleum, Blue stonecrop,Azure stonecrop many names for one plant! Blue flower I am told it grows quite well in Spain Africa, Malta. I am hoping someone knows where I might buy seeds? Thanks in advance Marisa