Hardy Palm and Subtropical Board
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Re: Large Ficus elastics in Mesa, AZ
The green ones used to be commonly sold as house plants from what I recall in the 80's and early 90's. By the early 2000's they became rare to find. Which is a shame because they seem to recover faster from a freeze. I'm not suggesting they're at all hardier, more so they rebound quicker.
Comparing a freeze in PHX vs Orlando. With all of your humidity, rain and more noticeable cloud cover than PHX, plants rebound quicker there.
I crunched the numbers for PHX and Orlando years ago. Over 30 year average both are solid 10a (the old maps haven't been updated in a long time). That being said, 10a means you still expect a freeze yearly if you'd at the bottom end of 10a. 30, 31, 32 are all 10a temps. Certainly an interesting cross over zone, between freeze free, and 10b.
Zone 10a Phoenix, Arizona
weather.com averages for PHX: January = 67°F/46ºF, July = 106°F/84ºF