Sassafras root, the original source of root beer, stays in season all you. You use it for tea, for making root beer, and as a cinnamon-like seasoning.
Another tree we'll look for is the black birch. It grows in the woods, has twigs that taste like wintergreen, and provides the raw material for birch beer. You can steep the twigs in hot water to make a fabulous tea, with anti-inflammatory properties similar to aspirin. Or thicken the tea with agar, season and sweeten it, and make black birch Jello!
There are plenty of late spring herbs and greens in season at the edge of the woods. We'll find mugwort, a Chinese herb used as a tonic for the female reproductive system. Since I've learned these herbs, I've never suffered a monthly cramp! We also may find greens such as greenbrier, Asiatic dayflower, lady's thumb, lamb's-quarters, and field garlic, all great for salads, sandwiches, and soups.
We'll hunt for the flowers and tops of garlic mustard, which taste like garlic, and jewelweed, a panacea for skin irritations that also cures mosquito bites and prevents poison ivy rash.