Foamy Bells are a cross between heucheras and foam flowers (Tiarella cordifolia), creating a year-round, shade-loving, low-growing point of interest for the garden. Due to its short stems, Heucherella 'Mojito' tops out between six and 12 inches tall, but spreads up to 18 inches wide, forming a dense, compact mound of bright reds, golds, and greens. More gold in the spring, then lime green as the weather warms, the leaf's veins are always a deep red, adding a pop of color to the shadiest gardens.