Add lobelias to bring rich, true blues in the garden. These trailing plants flower prolifically in spring and fall, almost covering themselves in flowers. Annual lobelia is a cool-season plant that does best in shade in the South, though it loves partial shade in the North.
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 w/ relatively cool summers.
Black-Eyed Susan-If summer heat makes your garden fade, add this versatile plant. Hot temperatures bring out the best in this summer border and container favorite. Plant Name: Rudbeckia fulgida Growing Conditions: Full sun and well-drained soil Size: To 3 feet tall and 2 feet wide Grow it with: Black-eyed Susans make for a great addition to a casual garden bed, as do the summer blooms of accenting phlox. Zones: 4-9