Alas, my father has cut down the white mulberry in their yard in Delaware. I spent weeks trying to identify the darn thing when I was a teenager -- we had two more recognizable red mulberries further down the yard, but I just couldn't wrap my head around a white mulberry tree! The red mulberries were tart and enormous, while the white mulberry produced a small, sweet berry. It was hard to tell when the white berries were ripe -- there was a just-detectable darkening around the tips of the individual berry segments.