In article , K
writes

I still think yours wasn't a black mulberry ;-)
Fruit too small, growth too fast.


Well it was seed of morus nigra from the RHS and the white mulberry is
different altogether!
I assume it's like an apple tree grown from a pip. It doesn't have the
characteristics of its parents necessarily.
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk