Lake Wilderness Arboretum Fall Plant Sale: 10 a.m.-4 p.m. Sept. 13. Discounted and clearance plants. 22520 S.E. 248th St., Maple Valley.

WaterWise Demonstration Garden: Self-guided tours showcase plants and gardening methods that conserve water. Plant list available at garden or from Web site. Guided tours available for groups of 12 or more with advance registration. Dawn-dusk daily. Covington Water District, 18631 SE. 300th Pl., Covington. 253-631-0565, www.covingtonwater.com.

“Saving the Earth, One Habitat Garden at a Time”: 7-8:30 p.m. Oct. 7. Free seminar led by Brett Johnson. Also native plant trunk sale and show. Maple Valley Community Center, 22010 SE. 248th St. 425-413-2572, info@LakeWildernessArboretum.org.

Lake Wilderness Arboretum tours: Events: 10 a.m. the third Saturday of the month, docent tours; Forty-acre arboretum features trails for walking, jogging and bicycling, and the Smith-Mossman Garden’s collection of western azaleas. 22520 S.E. 248th St., Maple Valley. 425-413-2572 or www.lakewildernessarboretum.org.

Green Thumb Garden Club: 7 p.m. the first Friday of the month. St. John the Baptist Church, 25810 156th Ave. SE., Covington. 253-630-7674.