BLUE FLAG IRIS
This moisture-loving iris features violet-blue flowers from May into June. Although the blossoms are short-lived, the lush foliage lasts all season.
Plant: In the moist center of the garden.
Size: 2 to 3 feet tall.
Best in: Full sun to part shade.
SWEET BLACK-EYED SUSAN
This taller, bushier cousin of the common black-eyed Susan is a long-lived wildflower that boasts fragrant lemon-hued flowers in late summer.
Plant: On the garden's edge.
Size: 3 to 5 feet tall.
Best in: Full sun to partial shade.