During this all-day tour with horticulturist Chelsea Mahaffey, spend the morning at Oak Spring, the former home of philanthropists Paul Mellon and Rachel “Bunny” Mellon, usually closed to the public. The nearly 700-acre estate includes the main Mellon residence, its extensive gardens with examples of Bunny Mellon’s landscaping, and the formal greenhouse. The afternoon takes you to the University of Virginia’s Blandy Experimental Farm on the former Tuleyries estate, which includes the State Arboretum of Virginia.