Yet another great black-eyed Susan, ?Henry Eiler? is unique in that the petals are rolled instead of flat, giving the appearance of a quill. The center brown discs are dome-shaped. Leaves have a very mild sweet odor. Plants are usually 3-5? tall with stiff stems that do not flop. Start seeds six to eight weeks before the last frost or direct sow them into the garden two weeks before the last frost.