"Owls: Rulers of the Night Skies" is presented from 6 to 8 p.m., Thursday, Dec. 15; $20, $15 member. Mary Warren leads a photography workshop with behind-the-scenes access to the tropical greenhouse from 8 to 9:30 a.m., Saturday, Dec. 17; $20, $15 member. "Edible Plants of the Sonoran Desert" explores how indigenous groups have used plants for food, fiber and healing, from noon to 3 p.m., Saturday, Dec. 17; $32, $25 member. Session leaders share recipes and samples. Visit tucsonbotanical.org
to register or for more information.