For a jolt of color that has a hint of whimsy, you might want to consider a spirea shrub or two. O’Neill is partial to the “gold mound” spirea (Spiraea Japonica), which has vibrant yellow foliage and clusters of pink flowers. Though this species only grows 2 to 3 feet, its can’t-miss scheme will make it stand out. “It's a low-maintenance shrub that adds a pop of color throughout the growing season,” he adds. It’s easy to manage, too: Once this shrub is established, it’s low-maintenance, drought-resistant, and requires minimal pruning.