Seeds Rudbeckia triloba Browneyed Susan, Brown eyed Susan, Thin leaved coneflower, Three lobed Rudbeckia. This biennial makes an excellent, self sown flower in a mixed border or wild garden. It reaches up to 5 feet tall and has a long lasting, spray of small, daisy like blossoms in bright yellow with purple black centers. The flowers are in late summer bouquets.