When I was a teenager, my parents had a yard with a fruitless mulberry tree in the backyard. My boyfriend's parents had one in the front yard. I assume people buy fruitless trees because they don't want rotten fruit dropping off and ruining their nice cars or whatever.
But I think of all the years I missed out on the wonderful taste of real mulberries. My neighbor has both red and white mulberries ripening right now and they are amazing. The white ones are not so pretty but really yummy. They taste like honeysuckles. The red ones turn black when they are ripe. They are a bit more tart but also yummy. My neighbor said the birds get most of them, and it keeps the birds away from her other fruit trees. If we had a ladder we could pick enough to make jam. But I'm perfectly happy just eating them one by one.