Indoors and Out, Opportunities to Enrich Your Knowledge

Here are some horticultural events scheduled for December and January.

The District

Now through Jan. 6: " A Midnight Clear." Check out the model train garden, as well as the miniature replica of the Mall, crafted from plant materials. 10 a.m.-5 p.m. Hours extend to 8 p.m. on Dec. 4, 6, 11, 13, 18, 20 and 27. Free. U.S. Botanic Garden, 100 Maryland Ave. SW. 202-225-8333, http://www.usbg.gov.

Dec. 1, 2: Holiday Wreaths Workshop. Create a designer-quality wreath; a selection of freshly cut greens, seasonal materials and other supplies is provided. Dec. 1, 9 a.m.-noon; Dec. 2, 1-4 p.m. Fee: $59. Registration required. U.S. National Arboretum, 3501 New York Ave. NE. 202-245-2726, http://www.usna.usda.gov.

Dec. 1: Family Workshop: Holiday Greenery. Join horticulturist Bill Johnson to create easy-to-make decorations from fresh greens. For ages 5 and up. Children must be accompanied by an adult. All supplies provided. Reservations required. 11 a.m.-noon. Fee: $5 per person. Hillwood Estate, Museum and Gardens, 4155 Linnean Ave. NW. 202-686-5807, http://www.hillwoodmuseum.org.

Dec. 7, 8: Wreath Making. Fashion a wreath tree from cedar boughs, magnolia leaves, berry-laden holly, pine cones and boxwood. All materials provided. Dec. 7, 10-11:30 a.m. or 2-3:30 p.m.; Dec. 8, 10-11:30 a.m. Fee: $35. Registration required. Tudor Place Historic House and Garden, 1644 31st St. NW. 202-965-0400, http://www.tudorplace.org.

Dec. 8-16: Winter Silhouette Bonsai/Penjing Exhibit. A display of trees from the permanent collection, after they have shed their leaves, showing the structure and beauty of bonsai. 10 a.m.-3:30 p.m. Free. U.S. National Arboretum.

Dec. 8: Holiday Wreath Workshop. Make a wreath with a mix of evergreens, cones and ribbon. Bring additional decorations and your own pruners. 10:30 a.m.-12:30 p.m. or 1:30-3:30 p.m. Fee: $40. Registration required. U.S. Botanic Garden.

Dec. 15: Holiday Herbal Gifts. Make spa products, home remedies and skin balms for gardeners. Recipes, ingredients and materials provided. 1-4 p.m. Fee: $28. Registration required. U.S. Botanic Garden.

Dec. 26, 27; Jan. 22, 23: Full-Moon Hike. Join an arboretum staff member on a five-mile hike, rain or shine, for ages 16 and older. Dress appropriately. Dec. 26 and 27, 8-10 p.m.; Jan. 22 and 23, 7-9 p.m. Fee: $19. Registration required. U.S. National Arboretum.

Jan. 9: Houseplant Care. Can't garden outside? Focus your energy on houseplants. Learn about plant pests and basic care. Noon-1:30 p.m. Free. Registration requested. U.S. Botanic Garden.

Jan. 15: Prevention Strategies for Invasive Species. Learn approaches to prevent the spread of invasive species. 9 a.m.-4 p.m. Fee: $55. Lunch provided. Registration required. U.S. National Arboretum.

Jan. 17, 24, 31, Feb. 7, 14, 21: Landscape Design for Homeowners. Through slides, hands-on exercises and homework assignments, this workshop series will provide the tools to transform your garden. 6:30-9 p.m. Fee: $180. Registration required. U.S. Botanic Garden.