Zone - Indicates the cold hardiness of plants by zone. Please refer to the USDA Hardiness Zone Map at the bottom of this page for further information, or go to the USDA website here.
Spread - Average width or spread of mature plants.
Height - Average height of mature plants.
3" pot - the size pot in which some of our annuals are offered. Dimensions are 3" wide and 3" tall.
Qt. - Quart : Most of our perennials are offered in quart sized pots. Dimensions are 4" wide and 5" tall. Capacity 24 fl. oz.
Gal. - Gallon : Some of our perennials & most of our trees and shrubs are offered in gallon sized pots. Dimensions are approximately 6" wide and 6" tall. Capacity 72 fl. oz.
We have researched plant distribution to determine the zones listed throughout this catalog, but the available information on hardiness is not totally reliable or complete. Many factors determine a plant's survivability in a specific garden: maximum and minimum temperatures, as well as their duration; depth of ground freezing; snow cover; summer and winter wetness; freeze/thaw cycles; the health of the plant; and an adequate fall season to allow dormancy, to name a few. Therefore, we cannot guarantee the accuracy of the hardiness zones listed in this catalog but instead encourage you to use them as a guide in your own experimentation. All bloom times and cultural information represent our experience with these plants in Chapel Hill, NC, located in USDA Zone 7. Depending on weather conditions, bloom times can vary considerably from year to year.
Please refer to the 1991 USDA Hardiness Zone Map, pictured below, as a good general guideline. A new zone map has been developed by the USDA which is considerably different from the current map. As of this writing , the map has not been officially released. To view the map, click here.