The abiotic factor which was used to classify regions into plant hardiness zones is Temperature.
What are Abiotic factors?
These are the non living component of the ecosystem and examples include water, temperature etc.
The average annual minimum winter temperature is what it taken into consideration when the zones are being classified with zone 1 being the coldest and zone 13 as the hottest.
Read more about Abiotic factors here https://brainly.com/question/12689972
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