Sunrich Series Cut Sunflowers. An early, male sterile, pollen free sunflower used exclusively for the cut flower market. A 48" - 60" plant when cut will have a height of 2 - 2 1/2 feet, with a 5 - 6" flower. Works best if direct sown with a 5" spacing. Need to keep a dense planting and do not over fertilize which will cause them to become too large for cut flowers.