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Location: South.AZ - Winter Zone 9a - Summer Zone 10 - Sunset Zone 12 - Koppen-Geiger Zone BSh Hot Semi-Arid
greening the desert solar trees
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Hi, thanks for this very promising thread. I like that you have expanded the climate zones. However, I'm not sure your expansion works for extremely hot-summer areas of the southwest, such as Southern Arizona and Nevada. We have weeks of 100+ F in the summer. Plants that can grow in other USDA zone 9a dry places will often not stand our summer sun.

Southern Arizona is - Winter Zone 9a (USDA) - Summer Zone 10 (AHS Heat Zone) - Sunset Zone 12.
USDA zones are about winter cold-proof, but in southern Arizona we need to be concerned about summer heat-proof too. This blog post explains it perfectly:
http://thetransplantedgardener.com/index.php/2018/06/01/portland-ore-shares-our-low-desert-zone/
And here's the Sunset zone: https://www.sunset.com/garden/climate-zones/sunset-climate-zones-arizona


And my Koppen-Geiger Climate Zone is: BSh - Hot Semi-Arid Climate (from https://www.plantmaps.com)

Your classification is "How cold is the winter?" and "How much rainfall?" but you need another question: "How brutal is the summer heat and sun?"
 
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