I know I'm not in the Rocky Mountains but having lived many years in eastern Wyoming, the climate is fairly similar. I live in Eureka, Nevada altitude 6500ft and the sun is scorching, not made for man or beast. It is very dry, zone 4b-5a and this summer has had, since the first of June, daily temperatures about 95F. While I have had only one fatality in my own garden, things are looking a bit sad. I am looking for ideas of (preferably flowering) perennial plants, herbs, very small shrubs or vines to start a very small hometown nursery (town of 800 people with nearest place to purchase plants 125 miles away). I have limited space so I want to focus on heat tolerance, though not necessarily drought tolerance (assuming that customers will water) though that would be an added bonus. They must meet the zone requirements. I am also looking at deer resistance as our town herd isn't too picky. I have tried extensively on-line but find that, for the most part, heat tolerance comes in zones 8-9. I would very much appreciate your input!