If you are looking best-of-the-best flowering perennial plants that are absolutely sure to draw hummingbirds, Black & Blue Salvia is a must-have plant for your hummingbird garden! A hardy perennial in USDA Zones 7a-10a, Black & Blue Salvia can be grown in garden beds or containers. In zones north of 7a, you can grow it as an annual or in containers that can be overwintered indoors. Salvia Black & Blue, also known as Blue Anise Sage, is a large-growing perennial plant that reaches about 4 to 5 feet in height with an equal spread. Perfectly designed for hummingbirds, the tubular deep cobalt-blue flowers, which look like an opened pelicans beak, are produced in abundance from late spring through early winter. Get all the details below!