Tiramisu Coral Bells A breakthrough in Heuchera breeding! In both spring and fall, the chartreuse foliage has a heavy smattering of brick red coloration that radiates out from the midrib of each leaf. During summer, the leaves lighten and develop a light silvery overlay. Cream-colored flowers appear in midsummer, although it is grown more for its fantastic foliage. Compact habit is perfect for containers or as edging. Increased tolerance of high heat and humidity over other species.