Excerpt from The NY Times, July 25, 2007
Below are sources for fresh blackberries, with recommended varieties and seasons. Intensely flavored blackberries like Boysen and Marion are especially worth searching out on the West Coast.
PUDWILL FARMS Nipomo, Calif. Varieties: Boysen, Nectar, Marion, Olallie, Triple Crown, Navaho and Kiowa, year-round.