Woodland & Community Volunteering: Garlic Mustard Derby in the Herbert & Hyonja Abrons Woodland Sat, May 16, 2009 Meet at Wave Hill House, 1–4PM View All Events Garlic Mustard is a rapidly spreading non-native biennial that thrives on shady forest floors, competing with native vegetation and altering soil chemistry. Help control this invasive herb by pulling as many as you can from the forest floor and giving native woodland flora a chance to establish. Light refreshments provided. Wear sturdy shoes. Call 718.549.3200 x223 for more information.