As spring approaches, here are some landscape-education opportunities in the region.
WASHINGTON
(U.S. National Arboretum, 24th and R streets NE; 202-245-5898; www.usna.usda.gov.

Learn about repotting bonsai, companion plants and viewing stones.
(Mark Finkenstaedt For The Washington Post)
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U.S. Botanic Garden Conservatory, southwestern corner of the Capitol grounds, 245 First St. SW; 202-226-4082 to register for programs; 202-225-8333 for information; www.usbg.gov.)
February
12 to May 1: Orchid Express: Visit the Smithsonian and Botanic Garden's orchid show. Experts are available to answer questions. Open daily 10 a.m. to 5:30 p.m. Free. Museum of Natural History.
18: Plant Family Album -- Orchids: Why are orchids unique? In this workshop you will learn about orchid biology, taxonomy and terminology. A short tour of the orchids in the conservatory will follow the class. 1 to 3 p.m. Fee $8. Registration required. Botanic Garden.
23, 24: Full Moon Hike: Experience Washington from a different perspective on this five-mile, mildly strenuous hike through moonlit gardens and plant collections at the arboretum. Dress for weather conditions. 7 to 9 p.m. Fee $12. Registration required. National Arboretum.
26: Bonsai Repotting: Join curatorial staff of the National Bonsai and Penjing Museum at this lecture and demonstration focusing on the horticultural and design issues of repotting bonsai. 1 to 2:30 p.m. Fee $12. Registration required. National Arboretum.
27: Children's Fun Day, Weed Attack with Woodsie the Owl: Bring your children for an adventure at the garden. Through songs, stories, a play and hands on activities, discover what invasive weeds are and what you can do about them. You can meet Woodsie the Owl and have your picture taken with him. 1 to 5 p.m. Free. No registration required. Botanic Garden.
March