These bright and cheerful members of the narcissus family are easy to grow. They are also what horticulturists call “perfect flowers.” Botanically speaking, this means that each flower can pollinate itself. Perfect flowers produce only a small amount pollen, and the grains they do make tend to be too heavy to float in the air and cause trouble for allergy sufferers. A flower that’s pretty and sneeze-free? Sounds just about perfect to us.