| For your convenience, we have reproduced
the new USDA Plant Hardiness Map. The hardiness zones are based on the average annual low
temperature for each zone. Many factors, such as altitude, snow cover, degree of exposure
to wind, proximity to bodies of water, excessive or minimal rainfall, soil types, etc. can
create variations within zones. Please understand that these abnormalities can adversely
affect your wildflowers. Thus, the spring and fall planting dates published on this page
should be considered generalizations. The above factors have a dramatic effect on
predicting precise sowing dates for each zone. Range of average annual minimum temperatures for each zone with recommended spring or fall sowing dates for wildflowers. |
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