Vanilla comes from an orchid. On March 11, 10 a.m. to 2 p.m., learn all about orchids from the experts including how to care for them. Hands-on activities will include the art and science of orchids. Learn how to re-pot an orchid. Pot one up to take home! Visitors of all ages are invited to explore the amazing world of orchids at this year’s Orchid Family Day. This program celebrates the exhibition Orchid Spectrum. Free. No pre-registration required. United States Botanic Garden Conservatory, 100 Maryland Ave. SW. usbg.gov.