“Hot Weather Gardening Tips” is the topic for the July Master Gardener Learning Session presented by the Dunwoody Community Garden and Orchard – Saturday, July 13, 11a-12p at the greenhouse complex opposite the skate park at Brook Run Park, 4770 No. Peachtree Rd. 30338. Master Gardener Richard Osterholz will focus on vegetables and ornamentals, with tips on watering and mulching, working in the heat, and plants that grow well in high temperatures. Free! Refreshments served. www.dcgo.org.