The Lemon Thyme which survived all with good graces is down to a single live stem, the rosemary died a while back, and the mint came back from a glorious near death from the dark days of spider mites to a lush vibrant thriving existance! Basil was super finicky and didn’t like the cold and died. The mint will get a little blackened around leaf tips after some freezing nights, but they’re usually not more than 2-3 in a row and it just keeps on ticking.
We’re in southern UT / northern AZ at the moment, temps can be 80f during the day and a bit below freezing at night (sleeping cold is fine, we’ll run the heater in the morning), humidity levels are generally arid / low unless we’re cooking nearby or there’s some rain in the area, usually 20-30% during the day.
Any edible herbs like mint that just aren’t very particular about their environment? Overall it’s really impressive they’re still alive after months in a van with wildly fluctating temperatures, humidity, elevation, etc.