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'Jefferson', tested as OSU 703.007, resulted from a cross of OSU 252.146 × OSU 414.062 made in 1993 by Shawn A. Mehlenbacher and David C. Smith
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'Jefferson' will produce trees that are 67% of Barcelona. 'Jefferson' trees have a more upright growth habit than 'Barcelona', making them easy to train as single-trunk trees and manage in an orchard.
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'Jefferson' has a high resistance to both Eastern Filbert blight and bud mite. These trees can be planted in high disease pressure areas.
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'Jefferson' roots abundantly from layer beds. It can also be produced from TC, Soft Wood Cuttings, and Suckering tie-off.
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'Jefferson' was released for the in-shell market as a replacement for 'Barcelona'. The nuts and kernels are similar in size to 'Barcelona. 'Eta', 'Theta', and 'Felix' should be used as pollinizers.