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How To Choose High-Elevation Plants
Gardening at high-elevations is a bit different from desert gardening and both are different from gardening along the coast. Different environments call for different plant choices. Anyone know some good plants for the 6500-7000 foot range?

Growing Cool Weather Vegetable Crops at High Elevation in Northern Arizona
Lots of useful information in this video. The guy really knows his stuff!

Growing Lavender in Colorado
I recommend English lavender, but stay away from the French and Spanish varieties for higher elevations since they can't handle cold temperatures.
https://davesgarden.com/guides/pf/go/289/

The Best Perennials for Colorado
I gotcha covered blackturtle.us. And here's a website to checkout:
https://plantselect.org/

10 High Altitude Plants for Colorado
And here's another website as a bonus:
https://www.5280.com/2019/05/the-beginners-guide-to-xeriscape-in-denver/

5 Heat Tolerant Perennials
These are supposed to be hardy in Zone 5 and a couple require very little water.

Ground cover plants for under trees
Some of these might be useful: Epimedium, Tiarella, Corydalis, Dicentra and Brunnera.

Perennial Ground Covers in my Garden
Here are some more ideas: Pachysandra, English Ivy, Periwinkle (Vinca minor), Variegated Vinca, Liriope, Yellow Stonecrop Sedum.

What is a good ground cover than can be used in heavy shade?
More on Pachysandra and a couple phloxes.

How to Grow LOTS of Blueberries | Complete Guide
Blueberries require acidic soil. This video explains how to lower the PH of the soil as well as all the other aspects of what it takes to grow blueberries.