San Juan County Welcome to the San Juan County Master Gardeners! Learn more about the programs we have to offer in our county. Our Program Contact the WSU Extension San Juan County Master Gardeners with your gardening questions. WSU San Juan County Master Gardener Program site Our Foundation The San Juan County Master Gardener Foundation exists to support the WSU Master Gardener program of San Juan County. The funds we raise make it possible for Master Gardeners to carry out their educational mission in the community. San Juan County Master Gardener Foundation site