The Friends of the National Arboretum needs help with the continued care of the newly restored Springhouse Run, a stream that runs through the grounds of the Arboretum and into the Anacostia River. The stream has been beautifully restored with pools, riffles, rocks and a waterfall. With the help of hundreds of volunteers, they have planted more than 30,000 native plants grown from locally collected seed. Help care for this new little ecosystem by pulling invasive weeds, planting a few more shrubs and perennials and picking up trash. No experience required. Volunteer days and times are Oct. 17, 24 and 31; 10 a.m. to noon and Oct. 12, 9 a.m. to noon. Must be 16 or older to volunteer. Register at fona.org/planting.