|'Darkest of All' is a perennial flowering daisy, to 2 feet tall, clump-forming and erect with very leafy stems. Leaves are lance-shaped and grayish-green. Flowers have narrow, long, thread-like ray florets in semi-double form. Summer flowers are over 1 inch wide, with dark violet rays and yellow centers. They prefer sandy soil and should be cut back after flowering to prolong the flowering time.