Specialty Crops

These pages have a wealth of information about farm management and specialty crops grown in Sonoma County. Our Sonoma County Farm Advisor retired; if you have questions beyond what you find here, please contact one of the following depending on your crop/need.

Steven Swain 
Title: Environmental Horticulture Advisor, Marin & Sonoma Counties
Specialty: Technical assistance to landscapers, nurserymen, arborists, and other landscape professionals.  I also work with other agency personnel to help provide private small-parcel forest owners with education and information to help them manage forestland in a manner that benefits all north-bay residents.
Phone: (415) 473-4204 
Emailsvswain@ucanr.edu

John A Roncoroni 
Title: Weed Science Farm Advisor, Napa County
Specialty: Weed Control and Vegetation Management in Perennial Crops, Cover Crops and Aquatic Weed Control.
Phone: (707) 253-4221 
Emailjaroncoroni@ucanr.edu


PV cropped with tree
Paul Vossen, Farm Advisor Emeritus

Paul Vossen retired after 35 years as Farm Advisor in Sonoma County. During that time, he worked with the county's 800 small-scale commercial farmers who grow olives, tree fruits, nuts, berries, vegetables, herbs, cut flowers, and other specialty crops on about 8,000 acres. His goal was to help farmers, processors, and marketers make a profit in local agriculture while promoting sustainable practices. His research and educational program emphasized crop diversity. He also managed the 200+ volunteers in the Master Gardener Program who help educate home gardeners about pest management and good cultural practices.