Rock ‘N Grow Popstar Stonecrop Sedum grows in a rounded shape to less than a foot high and 16 to 20 inches around. The bouquet of salmon color is a perfect complement to blue-green foliage found on this and other garden plants. Popstar is low enough to feature as a filler in a container, in a bed before taller shrubs or as a mass planting. The low-growing shrubs can cut down on weeds and erosion and the faded flowers look great in winter.