The mother tree of these seedlings, Gobbler Sawtooth Oak (Quercus acutissima var. 'Gobbler'), is widely regarded as one of the most productive bearers of acorns, usually producing a heavy crop of nuts every year. Mature trees are said to be able to fill two to three 8-foot truck beds.
These 6 to 18" tall bare-root GSO seedlings are grown in air-pruner beds to create a fibrous, many-branched root system.
Photo Credit: Júlio Reis, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons