Longwood Gardens EditDeleteReturn to The PSSE Membership Directory First Name Heather Last Name Drzal Organization Name Longwood Gardens Title Director of School and Youth Programs Listing Category Other. Please specify: Address PO Box 501 City Kennett Square ZIP Code 19348 Website www.longwoodgardens.org STEM Ecosystems PA SEED STEM Ecosystem Contact listing ownerSend MessagePlease log in to be able to send messages to the listing owner.