how i wish i’d actually have the need for shears on my blac mulberries! Nigra’s literally add just ~6" tall and wide every year where am at.
they do fruit quite densely, so any additional branches they accumulate yearly, even if each is a mere 6" long is good enough for me.
in effect, have come to terms that am no longer growing them for myself, but more as a fruit-bearing heirloom for the younger generations lol!