Mariposa County
University of California
Mariposa County

Master Gardener Helpdesk/Helpline - We are here to assist you!

Help Desk
UC Master Gardeners staff help desk and phone helpline serving Mariposa County, including Greeley Hill, Coulterville and Lake Don Pedro. Our volunteer staff promotes successful and sustainable gardening practices by providing home gardeners with research based information from the University of California and other academic or government institutions. The staff has access to an extensive library, University of California Agricultural Advisors, university internet sites and a microscope for researching home gardening problems. Home gardeners can bring their questions or specimens to the Help Desk or contact the Helpline by phone or email.

Office Location:

UC Cooperative Extension Office,

5009 Fairgrounds Road

Phone: (209) 966-7078



March - October:

Tuesdays   9:00 am to Noon and

Thursdays  2:00 pm to 5:00 pm 

Winter Hours November - February:

Thursdays 2:00 pm to 5:00 pm

Messages and emails will be promptly responded to.

In addition, gardeners may bring their questions to the Master Gardener Booth at the Farmers Market, each Wednesday from May to October, 5:00 - 6:30 pm.

Webmaster Email: