Grow Black Barlow Columbine from fresh Aquilegia vulgaris flower seeds. Black Barlow will produce beautiful, double petaled blooms that span 1 to 2 inches wide. The plants present flowers that are deep burgundy in color, looking almost black in the evening and on cloudy days. Black Barlow Columbine plants will reach a mature height of about 2 feet tall. The plants will form mounds of stems and foliage, grown from 4 to 5 seeds per mound. Each collection of Black Barlow Columbine plants can spread roughly 18 inches wide.