Multi-grafted English Walnut
Mother tree used for grafting stems of hybrid seedlings so they'd grow and produce more quickly. The nuts and leaves on each branch are slightly different.
A mother tree used as understock for grafting hybrid walnut seedlings so they'd grow and bear nuts more quickly. Each major branch carries a different variety.
This particular tree is important because it is one of the last remaining examples of how Burbank conducted his experiments with fruit and nut trees.
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