Although 11-13, Potomac, and Susquehanna all share the female parent BEF53, they apparently have different male parents and were possibly conceived in different years. The dates assigned to them are of plant selection, not propagation. In terms of measured genetic distance between 36 cultivars in 2003, Susquehanna has nearest neighbor Shenandoah (distance = 7), Potomac has nearest neighbor 2-10 (distance = 2), and 11-13 has nearest neighbor 3-21 (distance = 4).
Doesn’t answer my question about hybridization of (11-13 x NC-1).
11-13, late ripening 4 fruit clusters, up to 4 weeks apart.
NC-1 early ripening.
They appear to be genetically distant & a good match for varietal improvement.