Shagbark Hickory (Carya ovata) is widely regarded as the most flavorful of all the hickories, because they really are delicious.
Shagbarks are the fastest growing of all the hickories, but even still they are pretty slow growing. These 1-year seedlings are between 3 and 8 inches tall, sold as bare-root seedlings.
Photo Credit: Ekem, CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons