It’s a good idea, yet I’m sure this would work so good for a couple reasons
USDA Plant Hardiness zones are for approximate climate suitability for plants in the soil, not in pots. Also, the actual hardiness of plants in pots, imho varies somewhat with the type of pot used. For example a net pot vs a nursery plant vs a thin walled plot vs a thick pots.
Secondly the USDA PH zones are changing as the climate is changing. I believe I recently read USDA has its hands full trying to create algorithms to model multiple locations a new zonal map to reflect climate changes at this time.
The most recent online map is posted in 2012, yet it’s data is from the 30-year period 1976-2005. So 17 year old data.
The reality is that this map is way off is based upon the data that
nineteen of the hottest years have occurred since 2000, with the exception of 1998, which was helped by a very strong El Niño. In fact, the year 2020 tied with 2016 for the hottest year on record since record-keeping began in 1880 (source:
NASA/GISS).
It seems even a new USDA map wouldn’t be accurate as per the past methodology. It would have to be more dynamic, changing at a much quicker rate to be helpful.
Thus the forums once set up, would have to change as the changes were made.
btw: The Koppen system was modified by Trewartha climate classification system. Better, yet still not dynamic.
cheers
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