Kaester can grow into a large tree. There is an old tree at the Prusch park in San Jose. Most likely, my tree has originated from that tree in San Jose. The fruits are very good in flavor, ripen in July. The tree requires regular watering. They don't grow as fast as the white or macroura species do. The cuttings can be rooted, and they graft fine onto alba cultivars.
Noir de Spain maybe a smaller tree than Kaester. The fruits are excellent, very complex, ripen in July. They might be a bit juicier than Kaester, but otherwise very similar in the flavor. I failed to root cuttings from this tree. However it grafts easily onto the white mulberry.