Originally from the West Indies and South America, cannas are one of the showiest summer bulbs you can grow. These lush tropical plants produce large — sometimes colorful — leaves, and tall flower stalks with vibrant blossoms. Depending on the variety, cannas can grow a few feet tall to more than 10 feet tall. Dwarf varieties look great in large containers combined with petunias, sweet potato vines, and other low-growing annuals. Larger varieties make a strong, elegant statement planted at the back of flower beds or grouped together in showy islands of color. Because they tolerate moist soils, cannas can also be planted along ponds or in a wet spot in the yard.