Middlesex County will hold a free backyard composting workshop at 10 a.m. April 10 and a free vermicomposting workshop 6:30 p.m. April 13, both at the Rutgers Cooperative Research & Extension EARTH Center at Davidson Mill Pond Park, 42 Riva Ave., South Brunswick.

Preregistration is required by calling 732-745-4170 or e-mailing solidwaste@co.middlesex. nj.us.