Hardiness zones are designations given to geographic areas determined by their lowest average cold temperatures. String beans grow in many zones, but knowing when to plant string beans can be challenging. There are some points of reference to follow for planting in U.S. Department of Agriculture hardiness zone 6.
U.S. Department of Agriculture hardiness zone 6 is any area that has an average cold temperature of minus 10 to 0 degrees Fahrenheit in the winter. It runs in a band across the U.S. from Rhode Island through the parts of southern Pennsylvania, Ohio, Indiana, Illinois, Missouri and Oklahoma, and parts of Nevada, New Mexico, Arizona and Oregon. A few other states have small pockets designated as zone 6.
String bean is another name for green bush-type beans. The name came from the fiber that developed along the seam of the pod. Typically, the fiber is much smaller today and the beans normally are referred to as snap beans.
Beans, including string beans, are warm-weather crops. They should not be planted until all danger of frost has passed. The University of Illinois Extension and the Utah State University Cooperative Extension recommend mid-May. A rule of thumb is that soil temperatures should be between 60 and 85 degrees Fahrenheit; otherwise string bean seeds will not germinate.
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