Gloved hand of gardener holding mulch. Rabbit bedding containing straw and manure is used for mulch and composting in an Artichoke bed. Master Gardener Coordinator at UC Cooperative Extension's Common Ground Garden Program, offers training at a workshop in her garden in Pasadena. Once trained, Master Gardeners provide free gardening workshops and their technical expertise to approximately 60 public community gardens, hundreds of school gardens, and many senior and shelter gardens?throughout Los Angeles County. California, USA