comparing true nigra members-- the noir, standard persian and black beauty triumvirate
noir of spain and black beauty seem to be weeks earlier than standard persian, even though former two are ~two feet tall, and the latter was obtained as a 7 footer.
noir with its first mature fruit. Apart from the tick-like fruiting habit, one could tell it is a true nigra if both sides of the leaf are hairy/velvety. Not sure if macro captured enough details
persian bears bigger berries, but takes longer to mature. I guess you can't rush perfection..
black beauty mature at the same time as noir. Would have concluded they are one and the same if not for noir being the only variety which also bears multilobed leaves mixed with the regular heart shape
and below is the faux nigra being sold as 'tissue-cultured ever-bearing black beauty dwarf morus nigra' by many online sellers--including supposedly reputable ones. It has the same tick-like fruiting habit, and has short internodes and tiny foliage(hence the dwarf label), but could grow 6 feet in one year, which is unheard of among true nigras. At least in desert conditions. Berries are good, but not as perky as true blacks. Shouldn't complain about it though since it is very early bearing.