A Master Gardener is a volunteer of the University of California Cooperative Extension who answers questions, diagnoses plant problems, and gives horticultural assistance to the public via telephone, plant clinics, demonstrations, talks, and the mass media on vegetable gardening, trees, pesticides, recycling, soils, lawns, disease, insects (home and garden), house plants, and related topics using University supported research. Master Gardeners help to prepare for, organize and conduct specific educational activities.