Among the darkest flowers you can grow, Espresso Gladiolus boasts deep crimson petals that frame pure white stamens. Use them to add dramatic contrast to perennial beds awash in soft lavenders and pinks, or let their rich red hues glow against evergreen foliage. Sun-loving and easy to grow, these gladioli attract hummingbirds, resist deer, and make exceptional cut flowers. Be sure to plant extras for bouquets!