I have a few hundred 3-yr old seaberries in the
permaculture nursery. They're now 4+ feet tall (some are over 5'!).
Gotta make room for a new vineyard, selling them in bundles of 5, 10, 25, and 100 here:
http://newfarmsupply.com/collections/frontpage/products/seaberry-sea-buckthorn
Grant