Perennial edibles: Buffalo Gourd (Cucurbita foetidissima) is a perennial squash of arid lands in North America. It is tolerant of both intense cold and heat. Though the fruit is hard and bitter, the seeds are edible much like cultivated pumpkin seeds.
Delphinium Hummingbirds love delphinium, which blooms in early summer. Height for these perennials can average anywhere from 2 to 8 feet tall, depending on variety. Delphinium requires rich soil, and areas with relatively cool summers.
Andropogon gerardii 'Rain Dance' (Rain Dance Big Bluestem Grass) is a showy prairie native grown for its outstanding maroon-red late summer and fall foliage. A wonderful companion for many late season blooming perennials.
Fern: Feathery fern look fabulous by the second year of planting, but by the fourth year, their prolific ability multiply means the rest of the shade bed is about to succumb to this voracious spreader.