Trees and shrubs lend your gardens a ton of ... native to South America and the Caribbean. It features small clusters of deep-blue-toned flowers, and as the blossoms age (usually the flowers ...

Blue butterfly bush A semiwoody perennial ... in an expanding clump and will stretch to 5 feet in height. The small, sky-blue flowers are arranged on spikes, and you'll get the best show if ...

That one is another close relative, Dalea greggii, a super ground-hugging mat of gray foliage with small blue flowers in spring. Indigo bushes were originally under genus Dalea but have been chan ...