Within half an hour of meeting Alexis Nikole Nelson — forager and bonafide — I learned a remarkablequantity of new things. I learned that mugwort is a towering weed that spreads in drifts of soft green quills, with a piney bite that rocks the socks off roasted potatoes. I learned that young elderberries can become pickled capers (don’t pop them raw!), and that mulberry leaves can be crushed into a caffeine-free dupe for matcha. But the most remarkable part is all of this was revealed within a scant hundred yards of a busy urban park in Columbus, Ohio.