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Contact Us

Call a Helpline:
   Arroyo Grande  (805) 473-7190
   San Luis Obispo  (805) 781-5939
   Templeton  (805) 434-4105

Send us an email: anrmgslo@ucanr.edu

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Helpline: Ask a Master Gardener


Master Gardener Helpline volunteers are available to answer your gardening questions and evaluate your specimens. We use science-based resources and provide you with evidence-based research and advice.

Send Us an Email


An attached photo is helpful in diagnosing your plant problem. Take close-ups of the surfaces of the leaves, and include a photograph of the entire tree or plant. Flowers, shapes of leaves and the place where the leaves attach to the stem are helpful in plant identification. Include your location in the county, as problems vary from area to area. Send photos of insects, top and underside, if possible.

Call or Visit in Person  (Bring us your samples)

San Luis Obispo: (805) 781-5939

University of California Cooperative Extension
2156 Sierra Way, Suite C
San Luis Obispo, CA 93401

Volunteers available Mondays and Thursdays 1–5 PM

Front office is open and can accept samples 8:00 AM to 5:00 PM Monday through Friday.

Arroyo Grande: (805) 473-7190

County Agriculture Commissioner's Building
810 West Branch Street
Arroyo Grande, CA  93420

Volunteers available Wednesday 10 AM to noon

Front office is open and can accept samples 8:00 AM to 2:30 PM Monday through Friday.

Templeton: (805) 434-4105

County Agriculture Commissioner's Building
350 N. Main St., Suite B
Templeton, CA 93465

Volunteers available Wednesday 9:00 AM to noon.

Front office is open and can accept samples 12:00 PM to 2:30 PM Monday through Friday.