The funny thing is, this atmospheric, unused old card’s caption on the reverse locates these Gardens near Kennett Square in Pennsylvania, while the caption on the front designates Wilmington.  So — with apologies — we go with Wilmington, but were curious.  So as we often do, we Googled.  The result?  Officially, the address (and actual location) are Kennett Square, but the person most responsible for the Gardens’ development, Pierre S. du Pont, is probably more well-known for his association with Delaware.  Who knows what the card’s designers were thinking?  Too late to ask them.  Grade: 1