Fall is a great time for planting shrubs , so last week I set off for Fordhook Farm , the homestead of the W. Atlee Burpee company in Doylestown , Pa. , to see its hydrangea collection , which has expanded through Burpee 's purchase of Heronswood Nursery in Kingston , Wash. , founded 20 years ago by Daniel J. Hinkley and Robert Jones .