Links to Northeast places, businesses and other websites that I like, in no particular order

Seaside Daylily Farm
www.seasidedaylily.com

Massachusetts Horticultural Society
www.masshort.org

Maine Cooperative Extension 
http://www.umext.maine.edu/

New Hampshire Cooperative Extension
http://extension.unh.edu/ 

Massachusetts Cooperative Extension
www.umassextension.org 

Berkshire Botanical Gardens
http://www.berkshirebotanical.org/

Boston Gardens
www.bostongardens.com 

Connecticut Horticultural Society 
www.cthort.org

Cornell University Cooperative Extension 
http://www.cce.cornell.edu/ 

Connecticut Cooperative Extension
www.extension.uconn.edu

Rhode Island Cooperative Extension
http://www.uri.edu/ce/index1.html