Every time I look up a plant from anywhere else in the world but here, there is this USDA zone number so I have taken to checking the map to find out what minimum temperatures a plant can handle. So that is helpful but what I don't understand is why there should be more than one zone, or a range of zones.
Surely if there is a minimum temperature a plant can handle than that is it?
There is a post in here https://www.helpfulgardener.com/forum/vi ... p?p=275693 that really says what I was thinking about the usefulness of this information. I would prefer information on a website that give min and max temperatures, rainfall, general climate etc.