no way ! Mulberries -- delish, nutrish , the only thing to watch out for is STAINING.
We had one in the garden as kids and we would go in under the tree to get the berries - come out with stained hair (all of us very fair), stained lips , stained fingers, clothing . Starlings , not aware of us , would be on the tree picking away right above us .
We were trend setters with the blue hair streaks.
Purple - mature , ready to eat. Red , not ripe .