An economical input option for natural daylength production of the popular perennial rudbeckia. No need for special treatments and it also puts out more stems than market standards. Zones 3-9. When gardeners dream of blacked-eyed Susans, this standard perennial is the plant they see. Great in gardens, backs of borders, and even in large containers. Prized for cut flowers, Rudbeckia also highly attracts butterflies and birds.