The order from Trees of Antiquity arrived on 3/21 and I planted the 5 jujubes and 2 plums on 3/22.
4 of the jujubes with no fruit-set are in an almost completely full sun location near the driveway (maybe missing a bit of sun at dawn). The one with the tiny fruit is on the other side of the house is a spot which I think is missing a bit of afternoon sun (still lots of light, but not quite complete).