Harris propagates all of their citrus trees inside a USDA improved screen house. Therefore, they can, and do, ship citrus to other states. I'm in Colorado and I buy trees from Harris. Even though their trees are USDA inspected and approved for shipment, I don't think they can ship into California. Not being able to ship into California, is not Harris's fault, but California's own ban on shipping citrus into their sate, However, it would be worth a telephone call and Ruth at Harris. There is a very slight chance, although I doubt it, that a California shipment could be possible, due to the fact that Harris's trees are USDA inspected and insured to be disease free, and insect free.