UC Master Gardeners of Humboldt & Del Norte Counties

Newsflash: Residents Urged to Report Possible Invasive Pest on Grape Plants Sold at Costco

The County of Humboldt’s Agriculture Commissioner is urging residents to take immediate precautions after the invasive glassy-winged sharpshooter (GWSS) was discovered on grape plants sold at Costco stores throughout California. 

The Costco store in Eureka, located at 1006 W. Wabash Ave., was among those that received these grape plants from Burchell Nursery, a wholesale nursery located in Fresno County. The issue occurred at the nursery supplier level, and the local food supply has not been affected by the discovery of this insect. 

Visit https://humboldtgov.org/m/newsflash/home/detail/6231 for more information.

Welcome to the UC Master Gardeners of Humboldt & Del Norte Counties

As part of the University of California Agriculture and Natural Resources (UCANR), we serve our community by sharing research-based knowledge and sustainable gardening practices. Trained UC Master Gardener volunteers empower Humboldt and Del Norte County residents with practical skills to grow food, care for gardens, and protect California’s natural resources through sustainable, climate-smart gardening. Whether you’re a first-time gardener or a seasoned green thumb, we’re here to help your garden thrive in our unique climate.

The UC Master Gardener Program in Humboldt County began in 1988. Since then, over 1,000 people have participated in Master Gardener training in Humboldt and Del Norte Counties. These Master Gardeners have contributed over 27,455 volunteer hours, sharing research-based home horticulture information with the public. 

Advice to Grow By

Have a question about your garden? The UC Master Gardeners of Humboldt and Del Norte Counties are here to help! 

Getting help is easy—send your question to our Help Desk Team. Our trained volunteers provide free, research-based advice on all aspects of home gardening: fruit and vegetable growing, pest and disease identification, lawn and landscape care, soil and composting, water-efficient gardening, and plant selection for our climate. Our volunteers typically respond within 3 -4 business days. 

Please note that we focus on home gardening questions. We're not able to provide advice for large-scale commercial operations, identify mushrooms for consumption, or make landscape design visits to private properties. But if your question is about growing food, managing pests, improving soil, or cultivating a beautiful home garden here in Humboldt and Del Norte Counties, we're ready to help!

The Coastal Gardener Newsletter

A quarterly publication of articles and community events. The Spring 2026 issue is now available. Read the current issue

Sign up for our newsletter to receive seasonal gardening advice, upcoming events, and timely tips for Humboldt and Del Norte Counties.

Join Us for Events and Classes

The UC Master Gardeners of Humboldt and Del Norte Counties offer free workshops, demonstrations, and community events throughout the year. From starting seeds to hands-on pruning classes to seasonal vegetable growing workshops, our programs are designed for gardeners of all experience levels.

View upcoming events