Years ago, when this was explained to me it must have been explained incorrectly regarding warmer areas. See this https://www.whiteflowerfarm.com/hardiness-zones
This was my understanding and what i was saying
“to summarize—a plant listed as 3-8S/10W should successfully overwinter in zones 3 or warmer, tolerate humid heat up to Zone 8, and tolerate dry heat up to Zone 10.”
The same when i described microclimates.
