Dahlias are a great choice for both new and experienced gardeners alike. These tuberous perennials will grow in full to partial sun, in almost any soil, and are not usually favored by deer or rabbits. They are by far my favorite flower.
Top Plants That Thrive in Clay. Golden black-eyed Susan is a summer staple for sunny borders. 'Goldsturm' is the most commonly grown variety. It spreads quickly, but not invasively, to fill a planting bed with long-lasting color.
Tall Garden Phlox Phlox paniculata -- garden, tall, or border phlox -- grows 3 to 4 feet tall and bears large trusses of fragrant perennial flowers from summer to early fall. It's well suited to the back of the garden and cottage gardens.