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Master Gardener Program

NOTICE: Seeds from China

Unsolicited seeds from China have been arriving in the United States. To ensure that those seeds do not pose a threat to US and California Agriculture, the USDA and the California Department of Food and Agriculture are collecting the seeds with their packaging. If you receive a seed packet from China: 

  • DO NOT plant it or open it!
  • Write your name, address, email and phone number on a piece of paper
  • If you accidentally opened the package, place the packaging and all seeds in a zip lock bag. 
  • Drop off your seed packet with your name, address, phone number and email address to the UC Cooperative Extension Office at 5009 Fairgrounds Rd., Mariposa CA 95338. We would be happy to send them in for you.

Please feel free to call us at 209-966-2417 with any questions. 


Tomato IPM (Integrated Pest Management)

Check out our new series on tomato problems! You can view the entire series on our MGs on YouTube page.

Notice of Reopening Plan

Due to recent health concerns with the Coronavirus (COVID-19), our office will be open to in-person access to our lobby for the time being. We are still working and would love to talk to you.  Please call us at 209-966-2417 or email smace@ucanr.edu.  If you have a gardening question, feel free to call our helpline at 209-966-7078 or email us at mgmariposa@ucdavis.edu. We will be checking messages regularly and will get back to you as soon as possible. Our lobby is open at this time and you can drop off your questions and pictures; however, our helpline office is currently closed to drop-ins and cannot accept samples at this time. Thank you for your patience. 

Over the Garden Fence
How Can We Help?

Do you need help with your garden?  Have a pest problem?  Curious about what will grow well in our region? Contact our Helpline.

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Master Gardener Calendar of Events
Event Name Date

Mariposa Creek Native Plant Demonstration Garden - Photo Courtesy of Jim and Betty Johnson
Mariposa Creek Native Plant Demonstration Garden - Photo Courtesy of Jim and Betty Johnson