I love birch and evergreen teas. In fact, you can make a very pleasant , light tea out of bark and leaves from a lot of trees and bushes.
There are lots of things to eat in the bush, but many of the substantial meals involve digging and damaging things. After all, what you are doing is stealing their winter or reproduction food/energy supply. So I don't forage for such stuff on an established trail or protected area. But back in the bush... It actually takes a lot of research and practice to forage practically. A survival skill to practice when not thru hiking.