Hydrangea paniculata 'Limelight' is a relatively new cultivar of Hydrangea paniculata, the panicle hydrangea. Here, the large, dense, upright, cone-shaped flower clusters (to 8" across) open creamy white, then mature to chartreuse-lime and eventually acquire rose tones before finally fading to beige. As the flower show fades in the fall, the leaves turn attractive shades of red, making a stunning finish. Panicles may be cut for fresh arrangements or for drying. If left on the plant, they persist into winter, keeping up a display. Until you see 'Limelight' in person,  you will not be able to appreciate how lovely they are.