Black Eyed Susan Seeds (Rudbeckia hirta). No wildflower garden is complete without some Black Eyed Susan somewhere in the border. This robust perennial will turn heads wherever planted and withstand more heat and drought than most. This favourite blooms from July through to September and is an Ontario native plant. Golden yellow blooms with dark centres. Easy to grow, adaptable to most soils, trouble free and tolerant of heat and drought. Blooms well in full sun and light shade. Height 60-90 cm (2-3').