KEEPING OAKS HEALTHY ... UC Master Gardener David Peterson will give a talk on "Keeping Native Oak Trees Healthy" on Saturday, July 10, from 9 to 11 a.m. at the Elizabeth F. Gamble Garden, 1431 Waverley St., Palo Alto. Peterson will cover dangerous watering, oak diseases (including Sudden Oak Death), growth habits, compatible plantings and how to avoid common landscaping errors that can harm oaks. Information: Master Gardeners at 408-282-3105, between 9:30 a.m. and 12:30 p.m., Monday through Friday or http://mastergardeners.org.
TREE WALK ... An arborist will lead a free neighborhood tree walk through the West Bayshore neighborhood on Saturday, July 10, from 10 a.m. to noon. Meet at Ohlone Elementary School, 950 Amarillo Ave., Palo Alto. Information: 650-964-6110 or www.canopy.org.
STROLL THROUGH GAMBLE ... Paul Althouse, a Gamble Garden volunteer and retired owner of the Redwood City Nursery, will stroll through the cutting garden and share his knowledge about planting and managing the flowers used to create weekly arrangements at the house, on Wednesday, July 14, from 10:30 a.m. to noon, meeting at the Gamble Garden Carriage House, 1431 Waverley St., Palo Alto. Cost is $35 for nonmembers, $25 for members. Information: 650-329-1356 or www.gamblegarden.org.
ANNUAL TREE SURVEY ... Canopy and the City of Palo Alto are seeking volunteers to help out with the annual Young Tree Care Survey, on Wednesday, July 14, from 5 to 8 p.m., at Mitchell Park, and on Saturday, July 17, from 8 a.m. to noon, at Hoover Park. After a brief training, volunteers will check street trees and pass out brochures to nearby residents. Routes take one to two hours. Canopy will provide forms, clipboards, tools for tree first aid and water. Information: E-mail firstname.lastname@example.org.