So, White Mulberry is known to be able to grow near Black Walnuttrees, because it is immune to the juglone, but Red Mulberry would be killed under those same circumstance because it lacks Morus alba's tolerance. Fair enough. But what I haven't been able to discover, however, is if Black Mulberry can grow near Black Walnut. Does it share White Mulberry's tolerance of juglone, or is it vulnerable like Red Mulberry?
Been a hectic month, so I just now saw this. I' m in western Kentucky, and have a LOT of both trees on my property. In fact, a nice mature black mulberry that fruits nicely is about 50 yards from where I now sit--it's about 16-20" in diameter, with a slightly larger black walnut within 12' of it. Their branches and certainly roots as well intermingle. Several other young mulberries are coming up beneath walnuts, so they appear to do quite well with one another.