For those who are not familiar, "Plant Select" is a [quoting them here] cooperative program administered by Denver Botanic Gardens and Colorado State University in concert with horticulturists and nurseries throughout the Rocky Mountain region and beyond. The purpose of 'Plant Select' is to seek out, identify and distribute the best plants for landscapes and gardens from the intermountain region to the high plains.

Plants are chosen each year that thrive in the unique and variable conditions of Rocky Mountain gardens. These can be plants that have grown here for years and have not yet attained the popularity they deserve, known as recommended plants.Introductions represent taxa that are discovered by our cooperators, and are often superior forms or hybrids.

New plants listed for consideration for future promotions must be evaluated on:

Performance in a broad range of garden situations in the Central Rocky Mountain Region

Adaptation to the Central Rocky Mountain Region's challenging climate

Uniqueness

Resistance to pests (disease pathogens, insects, and mites)

Exceptional performance under low water conditions

Long season of beauty in the garden

Non-invasiveness

Capability of being mass produced

Longevity in containers (retail appeal)

Current availability from current propagators

Ease of propagation using basic propagation protocols

Availability of images of established specimens in landscapes (for publications)

and here's a link to all their plants over the past years, with clickable photos and info.

One of our local nurseries used to carry these introductions every year, but no longer. But this is a great place for ideas.

Here is a link that might be useful: link