Here we can talk about USDA Hardiness Zone, AHS Heat Zone, and Sunset climate zone for locations worldwide, and we can talk about what USDA Hardiness Zone, about what AHS Heat Zone, and what Sunset climate zone requirements each of our plants have.
I find that the hardiness zones can get about 5 degrees colder than the USDA says. They say that we are zone 7b yet the last two years we were zone 7a. That is happening other places too so I suggest that you drop the zone 5 degrees undernieth what they say it is when you are considering what plants to get. like zone 6a can really be zone 5b.
I will start out by sharing links that can help each member of this forum know the USDA Hardiness Zone, the AHS Heat Zone, and the Sunset climate zone for his or her area. Here is a start, I will continue this later.
Arborday hardiness zone (Arborday has their own hardiness zone system, if you live in the USA be carful that you know which hardiness zone is being stated for a plant, USDA hardiness zone or Arborday hardiness zone):
