Below is a list of five perennials that can be planted during mid-summer and that are promised to be drought resistant (if you water consistently for the first weeks until the plant becomes adjusted to its new home).
2. Coreopsis specimens (Tickseed) From 80-100 species of annuals and perennials that are part of the Asteraceae family. They have daisy like yellow or pink flowerheads that grow on long stalks and are attractive to bees. Long blooming period, great for cut flowers. A rapid spreader. Check species and your zone to make sure it thrives in your climate. Some species do well from Zone 3-9. Grow in full sun or partial shade. Deadhead (remove spent flowers) for continuous bloom.
3. Hemerocallis (Daylilies) These are one of the great workhorses of the garden. Daylilies are usually clump forming with thin, elongated leaves. Flowers come in a variety of forms and range in color from white to pink to orange to yellow to a deep burgundy. Many daylilies are repeat blooming. Although they are rapid spreaders, they look most impressive when planted in drifts. They do well in sun, but will do just fine in partial shade. Hardy in Zones 3-10.
4. Lavandula (Lavender) a group of aromatic shrubs and perennials that are grown mainly for their lavender spiked flowers full of fragrance which appeal to bees because of their high level of nectar. Does well in moderately fertile soil in full sun. Known to be grown abundantly in Mediterranean climates. Great for hillside plantings, border plantings and part of a perennial border. Leaves and flowerheads can be used as dried flowers, sachet and potpourri. Depending on the species, can be grown from Zones 5-9.
5. Sedum species (Stonecrop) Over 400 species of annuals and perennials that are usually succulent. The leaves are often fleshy and have 5-petaled flowers that bloom in the summer and the fall. Grow in fertile, well drained, neutral to a bit alkaline soil in full sun. Even when the flower is not in bloom in spring and early summer, the leaves and shape (fairly low growing mound) of the sedum offer an unusual texture and color to the mixed border or rock garden. Will continue to bloom throughout the fall season. Looks beautiful in the fall garden when combined with salvias, asters and fall blooming perennial grasses. Depending on species can thrive from Zones 5-9.
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