 Michelle Phillips, of the 1960s rock group The Mamas and The Papas, hosts this HGTV documentary. "Rock Gardens" takes a look at some rock musicians  personal gardens. The featured musicians are Grace Slick (of Jefferson Airplane), Micky Dolenz (of The Monkees), Mark Hoppus (of Blink 182), Darius Rucker (of Hootie and the Blowfish), Chaka Khan, and John Oates (of Hall and Oates).