"Interdisciplinary Explorations: The Idea of Nature" public lecture: 6 p.m. with reception to follow at 7 p.m. in the Simplot Ballroom, Student Union Building, Boise State University. "Getting to the Roots of the Matter: Trees in 19th Century Literature" presented by Susan Oliver, senior lecturer in English, University of Essex, England. Free. For free tickets for the reception or information about free parking, email email@example.com. Details available at scholarworks.boisestate.edu/ideaofnature.
Growing Great Tomatoes: 10 to 11 a.m. at FarWest Landscape and Garden Center, 5728 W. State St., Boise. Free. RSVP: 853-4000, farwestgardencenter.net.
Idaho Native Plant Society plant sale: 10 a.m. to 1 p.m. at MK Nature Center, 600 S. Walnut St., Boise.
Garden classes: At Madeline George Garden Design, 10550 W. Hill Road Parkway, Boise. Free. Register: 995-2815, firstname.lastname@example.org. The Bees Knees Planting Class, 11 a.m. Design with Idaho in Mind, 2 p.m.
Bonsai Society demo class: 6 to 7 p.m. at FarWest Landscape and Garden Center, 5728 W. State St., Boise. Free. RSVP: 853-4000, farwestgardencenter.net.
Idaho Botanical Garden plant sale: 9 a.m. to 2 p.m. May 3, Idaho Botanical Garden, 2355 Old Penitentiary Road, Boise. Benefits IBG horticulture programs and ensures practical experience for College of Western Idaho horticulture students. Half-price admission. 343-8649, idahobotanicalgarden.org. Members only, 4 to 8 p.m. May 2. Free with membership.
Ada Gardeners plant sale: 8 a.m. to noon at 10608 W. Cruser Drive, Boise. Proceeds benefit scholarships at the College of Western Idaho (CWI).
Catholic Women's League plant sale: 8 a.m. to 5 p.m. at St. Paul's Catholic Church, 510 W. Roosevelt, Nampa.
National Public Gardens Day: 9 a.m. to dusk at Idaho Botanical Garden, 2355 Old Penitentiary Road, Boise. Free. 343-8649, idahobotanicalgarden.org.
Idaho Horticulture Society plant sale: 9 a.m. to 3 p.m. at Boise Urban Garden School, 4821 Franklin Road, Boise. Proceeds benefit garden club community service projects and CWI horticulture program. Bring your own boxes. 870-1299, idhort.com.
Wacky Weeders Garden Club Plant Sale: 9 a.m. to 2 p.m. at 623 Los Luceros Circle, Eagle.
Golden Garden Club Plant Sale: 9 a.m. to 3 p.m. at 10305 Harvester Drive, Boise.