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Five years ago, when the American microbrew scene was exploding, craft beers were still largely made from grains and hops grown by factory farms. Slowly, though, brewers began embracing the locavore trend, planting hops on nearby acreage (like ) or using local spring water (like ).

Today that philosophy has reached its apex: adventurous brewers are creating distinctly regional beers by foraging their own ingredients, among them chanterelle mushrooms, sassafras leaves, and vanilla leaf. (See below.) Sampling them takes some dedication—most are available only on tap—but their numbers are growing. This spring you’ll find them at dozens of breweries across the country.

The foraged-beer trend got its start in 2011, in Colorado, where artist and hophead Eric Steen, 31, took eight home-brewers on a few hikes for ingredients like red currants and chokecherries. Before long he franchised the strolls, calling them the tours. Last year, on hikes across the West, he was joined by representatives from 35 U.S. breweries, including , , and . The original goal, says Steen, was to create a sort of terroir effect for beer. Plus, he says, “Connecting with a local plant or something growing wild nearby can provide patrons with a sense of native pride.”

Few breweries experiment with wild ingredients as devotedly as , which opened last March. Three dozen mason jars sit behind the bar, filled with everything from walnuts to black trumpet mushrooms, all gathered from the brewery’s 75-acre farm. “Look at the rise of farmers’ markets: people want something that comes from where they live,” says Scratch co-owner . “It’s fun to make that happen in beer. It’s a new frontier.”

The 5 Wildest Ingredients Appearing in Beer

1. ��󲹲Գٱ����������:��Yellow, funnel-shaped fungus that lends beer a buttery flavor and an apricot scent.
2. �����������ڰ�����:��A tree leaf often used as a thickener in gumbo, it adds a green-tea-like aroma.
3. ���ܻ����:��An invasive species brought in to control erosion in the South in the early 1900s; it adds a fruity flavor.
4. Vanilla Leaf: Ubiquitous in the Pacific Northwest, the plant adds—surprise!—a hint of vanilla.
5. Milk Thistle: The seeds are believed to have medicinal properties, particularly in protecting the liver against toxins. 

The 4 Best Breweries Using Foraged Ingredients

1.  (Denver): Ingredients are sourced during hikes in the Rocky Mountains; in 2013, it concocted a saison with wild sage.
2. (Durham, North Carolina): One of the few that bottles its foraged beers, including wild-fig and persimmon-spiced ales.
3. (Ava, Illinois): The constantly updated menu includes a German ale with toasted pig nuts, a Belgian dark with dried chiles, and a saison with wild ginger root.
4. (Portland, Oregon): Producer of organic and sustainable beers; last year it brewed a Belgian-style red ale made with vanilla leaf.