I constantly look for mulberry trees when I'm out and about. They're one of my favorite berries. I'd like to try making dandelion jelly too, but I don't live in an area conducive to that. Too many people using herbicides out here in the burbs; wouldn't feel safe.
I enjoyed the video:
My father forages for wild mushrooms all the time, mostly morels. Last year he took a trip from Michigan down to North Carolina, where I live. On the way, he hunted for morels. He found none, until he got to my house and we found bout a pound of them on the trails behind my house.
I guarantee we have enough leafy greens growing in our back yard to make a nice salad each night, but with my luck I would end up giving my whole family poisoned ivy.