I had read that these berries are edible, though very sour, so I tried one. I spit it out immediately. I did some further reading, and found that it takes a frost or two (which increases the fructose content) to make the berries palatable.
That's the idea, at least. I'm walking westward from New York City for nine months or so.
If everything goes according to plan, I'll be in Oregon when the clock runs out.
If nothing goes according to plan, maybe I'll end up in Peru or Mongolia or Pennsylvania.
You can read all about the details of my trip
if you're so inclined.