Route 1, PO Box 501 Kennett Square PA 19348-0501 USA Telephone 610-388-1000 WATER RESTRICTION UPDATE Welcome to the worlds premier horticultural display garden. Longwood Gardens was created by industrialist Pierre S. du Pont (and is sometimes referred to as the DuPont Gardens) and offers 1, 050 acres (425 hectares) of gardens, woodlands, and meadows; 20 outdoor gardens; 20 indoor gardens within 4 ...