Master Gardeners of San Mateo & San Francisco Co.
University of California
Master Gardeners of San Mateo & San Francisco Co.

Advice to Grow By... Ask a Master Gardener

Master Gardeners are certified UCCE volunteers located throughout San Mateo and San Francisco Counties.  Our office in Half Moon Bay is the center of our activities and hosts our Garden HelpLine, where we assist home gardeners with questions about gardening and pest management. 

Holiday Helpline and Office Hours

The Master Gardener Helpline will be closed on Thanksgiving, Nov. 27, 2014, and beginning Tuesday, Dec 16, 2014 resuming on Monday, Jan. 12, 2015.

UCCE San Mateo/San Francisco County offices will be closed from Wednesday, Dec. 24, 2014 until Friday, Jan 2, 2015.

Garden HelpLine 

Volunteer Master Gardeners staff the HelpLine on Mondays and Thursdays from 9am - 4pm. (We are closed on holidays.)

Call us: 650-726-9059 x 107 (Leave a message if we are not in.)

Email us:

For fastest service, please provide as much information as you can in your email:


City of Residence


Phone, Best time to call

Description of Problem/Question

For plant or pest problems, please attach photo(s).

  • For plant problems, include:
    • what the damage looks like
    • when symptoms first appeared
    • where is the plant located
    • age of plant
  • For pest problems, include:
    • what damage is occurring
    • extent of the damage (how widely spread)
    • when symptoms first appeared
  • What care has the plant received?
    • Irrigation: Drip/Sprinkler/Hand/Flood. How often?  How long?
    • Fertlizer: What type? How often? Last applied?
    • Chemical applications, if any (herbicides and/or pesticides)

Visit us: You are welcome to visit our office to consult with us. Please bring your plant or pest problems with you.

UCCE Master Gardeners of San Mateo & San Francisco Counties
80 Stone Pine Road # 100
Half Moon Bay, CA, 94019  map

Our hours are Mondays and Thursdays from 9am - 4pm (closed on holidays).

We also hold regular Plant Clinics in various places in San Mateo and San Francisco Counties.

Webmaster Email: