The Garden Club Federation of Pennsylvania. www.pagardenclubs.org
National Capital Area Garden Clubs www.gardencentral.org/ncafgc
Deer Busters (wildlife control specialist) www.deerbusters.com
Brookside Gardens www.brooksidegardens.org
Fine Gardening Magazine www.taunton.com/finegardening/index.asp
Garden Advice www.gardenadvice.com
The National Arboretum www.usna.usda.gov
Mountaintop Invasives http://home.comcast.net/~invasives