Summer forget-me-not (Anchusa capensis ‘Blue Angel’) is covered with 8-inch clusters of the most intense, true-blue flowers throughout the growing season. This native of South Africa thrives in sunny settings and dry soils and responds to periodic deadheading, the removal of spent flowers, by producing additional flower sprays. Deer avoid this plant because they dislike the prickly hairs on the stems and leaves, but butterflies and bees find the flowers' nectar irresistible.