After a cursory search, I realised I couldn’t find a single easy table online where USDA Hardiness Zones and AHS Heat Zones were pictured together, easily readable, and in centigrade. So, I made one, using the charts available on wikipedia.
Feel free to download, share, and use on your website.
Knowing which climactic zone you are in is vital to choosing the right plants for your garden. There are a number of other factors to consider, of course, such as rainfall, soil, snow cover, drainage, acidity/alkalinity, altitude, and latitude, but many of those factors can be manipulated either with labour, or the creation of microclimates.
Omg thank you, this is a really important pair of charts. I am so tired of explaining to garden center customers that the plant may indeed be perennial for our cold-hardiness zone but not in our heat-tolerance zone. Which is much harder to circumvent, I think.