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horticultural landmark features renowned vistas stretching down to the potomac river as well as its artful blend of naturalistic and formal gardens that offer year-round delight to visitors of all ages. in addition, there are extensive and creative play areas for children, demonstration gardens for both edible
and ornamental plants, a four-acre meadow, and scenic resting places for picnickers, artists, and romantics. other highlights include two small buildings with planted "living" roofs, one of the largest osage-orange trees in the nation, an orchard, a grove of rare franklinia trees, and frequent sightings...
https://en.wikipedia.org/wiki/River_Farm