Yarrow. Not only does yarrow tolerate heat and drought like a champion, but this easy-growing perennial is also a great cut flower -- and deer, rabbits, and most other pests won't touch it. It comes in a number of varieties with blooms in shades of yellow, orange, red, pink, and white.
Bush Sage Salvia is an all-around great plant. It's very tough, grows well in a range of conditions, produces beautiful flowers, and attracts hummingbirds. What's not to love? 'Raspberry Delight' offers gorgeous raspberry-red flowers over a long season: From late spring to early fall. Name: Salvia 'Raspberry Delight' Conditions: Full sun and well-drained soil Size: To 3 feet tall Zones: 6-10
Anise Hyssop - drought tolerant perennial.A North American native plant.Wonderful addition to the cottage garden. The North American natives found many uses for this herb. The Cheyenne Indians drank a tea of this herb to relieve a "dispirited heart."
from the website: "This bank has been planted up with lovely sun-loving, drought-loving perennials. The gardeners have stuck to only six different plants, and have repeated them over and over again in drifting lines. They could have crowded the space with all sorts of plants of all sorts of heights, but instead they have chosen to weave a pattern on the bank that pulls you up short."
Creeping Thyme. Plant in full sun to partial shade. Blooms all summer long. Will tolerate all soil types, is drought tolerant, rabbit and deer resistant. This old-fashioned perennial has a year round display of color. In early summer the plants are covered with stunning pinkish-rose flowers that last until the first hard frost. The stunning foliage stays all through the winter months. A very hardy perennial that attracts butterflies and can be grown throughout the country. Zones 4 - 9.
Pineleaf Penstemon A hummingbird favorite, pineleaf penstemon offers delicate, fine textured foliage and bright, orange-red or yellow flowers through the summer. Name: Penstemon pinifolius Growing Conditions: Full sun and well-drained soil Size: To 1 foot tall Zones: 4-9