These flowers were suggested by Denver Botanic Gardens as varieties that do well in Colorado and create blooms all year long to help pollinators. They were selected by monitoring for which varieties bees are particularly drawn to. I searched and found the local Rocky Mountain companies Botanical Interests and High Country Gardens sells seeds for many of them.
As a gardener in Denver I've heard of worm castings as a potential soil supplement/fertilizer before. I've been composting with a traditional aerobic/thermophilic system for a while. The research I've done recently is that worm castings or vermicompost is a much better fertilizer than traditional compost: