Hardiness Zone Activity (Page 2 of 4) in pdf

Hardiness Zone Activity Page 2

3. Why do you think there are different hardiness zones for different counties?

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4. On the United States National Arboretum website, the hardiness zones are given

for each state along with examples of woody plants that would normally succeed

in those growing zones. Visit and

write the common name of the six given plants below.

1. ______________________________ 2._______________________________

3. ______________________________ 4._______________________________

5. ______________________________ 6._______________________________

Think About It….

5. The first hardiness zone map was published in 1960 and was later revised in

1965. Because of improvements in technology and recorded data, our plant

hardiness zone map was again revised in 1990. This 1990 version shows in

detail the lowest temperatures that can be expected each year in the United

States, Canada, and Mexico. These temperatures are based on the lowest

temperatures recorded for each of the years from 1974 to 1986 in the U.S. and

Canada and 1971 to 1984 in Mexico. Based on environmental trends, make a

prediction of when the next revision of the hardiness zone map will be and what

changes we might see in average annual temperatures.

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Hardiness Zone Activity Page 2