Tary Campbell, construction project manager, certified water auditor and water-conservation specialist, joins landscape designer Jason Isenberg to discuss water-harvesting, xeriscaping, smart irrigation and repurposing swimming pools to conserve water and save money from 9 a.m. to noon, Saturday, June 25. $32; $25 members. Fee includes admission to the gardens. Call 326-9686, ext. 19, or visit tucsonbotanical.org to register and for more informationfor more information.