For your reference, we have compiled some links that we find interesting and helpful. Please let us know if the link is nonfunctional or out of date.
Hardiness Zone Map
This well-known reference shows the hardiness zones for the United States as updated in 2003
This tool allows you to view the hardiness zones by state and, further, by county. This helps address some issues of microclimates. The site is fairly advertising-intensive, but well worth visiting.
This interactive map allows you to view hardiness zones in local areas throughout Canada.
A good, general, reference covering about 35 countries.
A very good reference with a fair amount of background data.
An interactive map with corresponding temperature ranges - brought to us courtesy of Jelitto Perennial Seeds in Germany.
Shows the probable first and last frost dates throughout the US as well as the number of frost-free days in each area.
North American Native Plant Society
An excellent reference that includes featured plants, photos and a seed exchange - as well as listings and (when available) links to state associations.
Features a very comprehensive Native Plant Database that covers propagation, distribution, growing conditions and image gallery.
A great educational resource for New England - with links to their course schedules and to the Garden in the Woods.
For Primrose enthusiasts!
Dr. Leonard Perry at the University of Vermont may have created the grand-daddy of all informational link sites. There are links to perennial publications, perennial faqs, perennial sources, perennial, perennial, perennial...
For those of us who love to visit gardens, The Open Days Program provides a directory of private gardens throughout the US that have selected open days for garden visitors.
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