Just about every month, UC Irvine Arboretum nursery manager Laura Lyons holds a new volunteer orientation for people who are interested in volunteering in one of the arboretum’s different programs.

Bob Lyons, director of the JC Raulston Arboretum in Raleigh and a veteran horticulturist, is one of many gardening experts who will appear at Saturday’s benefit for the Ability Garden.