Summer Snapdragon (Angelonia angustifolia) is another Carson's greenhouse goodie and a plant that every Ozarks gardener needs to know. Why? Because it's airy and gorgeous in the garden, blooms like crazy all season long, and despite its delicate appearance tolerates heat and drought. It comes in blue, pink, lavender, white, and blue-and-white bicolor. The plant can grow to 18 inches tall and 14 inches wide. It blooms best in full sun but does well in part shade, too, and prefers humus-rich, well-drained soil. A winner all the way.