Supervisors postponed a vote last month on the Open Space District’s vegetation management plan so that the public has more time to review county staff’s responses to public critiques, which largely revolved around the issue of herbicides. The vegetation plan—a plan seven years in the making that will guide decisions for the district’s 34 preserves—would provide an overarching framework for managing the preserves, which now have individual plans or no plan at all. The district…