'Irish Eyes' Black-Eyed Susan A tender perennial that occasionally returns for an encore the following year, 'Irish Eyes' black-eyed Susan is best treated as an annual flower. It's named for the green eye of its daisylike bloom. Its height and habit make it look like a perennial, but it blooms nonstop all summer. It's not fussy about watering once established. Name: Rudbeckia hirta 'Irish Eyes'