Color your summer landscape with these 7 flowering perennial plants to thrive in the summer heat . These easy to grow and care for perennials are show-offs from June through September and excellent as cut flowers for indoor bouquets. Drought tolerant plants - Best pollinator plants! Coreopsis or Tickseed - fluffy green foliage is the perfect base for the tiny colorful flowers. Coneflower or Echinacea - yellow to pink, berry, white and multi-color blooms - long flowering. Nepeta - butterflies and hummingbirds love this plant. extremely fragrant. Rudbeckia or Blackeyed Susans - beautiful yellow...