The gardens were established on the site of the castle's previous kitchen garden by the American Friends of Blérancourt, with the arboretum funded by donations of the Colonial Dames of America – Chapter IV (Paris). Michel Boulcourt, Madison Cox, and Mark Rudkin served as garden designers. The gardens comprise four major areas:
Le jardin d'été (Summer Garden) - Virginia tulip trees with flowers of the new world including ornamental tobacco and American lily in parterres; designed by Madison Cox in 1989.