Everyone involved in the debate agreed that raising crops and livestock is agriculture. But they split over such proposals as including winery marketing efforts, even in a role labeled as “related, incidental and subordinate” and with county approval.

The Napa County Board of Supervisors on Tuesday endorsed revising the zoning code definition of agriculture to add marketing and sales; production and processing of agricultural products -- which in Napa County usually means a winery -- and farmworker housing. It will take a final vote at a future meeting.

“The sky is not falling,” Debra Dommen of Treasury Wine Estates said. “We’ll be operating under the exact same rules we’ve been operating under for the last 10 years.”