Peggy Cornett at Thomas Jefferson's Monticello tells us that
Corn poppies abound in the Monticello flower gardens, where they have reseeded for decades. Jefferson observed the "lesser" or "dwarf" poppy at Shadwell in 1767, and planted "Papaver Rhoeas flor. plen. double poppy" in a Monticello oval flower bed in 1807.