By the end of June here in New England, Mulberry (Morus sp.) trees are busy ripening fruit to feed birds and mammals alike. Last week, Kate St. John of Pennsylvania wrote of Mulberry's prolific nature and the tendency of planted trees to drop squishable fruit along walking paths (see Mulberries Underfoot). Several years ago, I found my first Mulberry crop with my shoes. If you happen to notice mushy berries underfoot, look up. Ripe fruit varies in color depending on the particular kind of Mulberry you find, ranging from light pink to dark purplish-black. Regardless of type, Mulberries are ripe when they are plump, juicy, and fall easily from the tree.