Henry was born on May 27, 1880, at Winterthur. He was the only son of
Henry Algernon du Pont and Mary Pauline Foster to live to maturity; by the time he was born, his parents had already buried five children. Their only other surviving child,
Louise E. du Pont Crowninshield, was a historic preservationist and founding trustee of the
National Trust for Historic Preservation. A shy and lonely boy who contrasted with his authoritarian father, young du Pont attended boarding school at
Groton School in Massachusetts. After graduating from Groton at the bottom of his class of sixteen, du Pont went on to study horticulture at the
Bussey Institution at
Harvard University, receiving his bachelor's degree in 1903. His best grade at Harvard was a B minus, for a garden study class. His mother, to whom he was close, died shortly before he graduated, which shook him profoundly and deepened his lifelong reticence. His father recalled him home to oversee the estate, a task at which he would excel. ==Holstein herd==