A tropical look is easier to attain in northern climes because these tubers overwinter in gardens as cold as zone 6. Part of the Tropi-cool Series, these new colocasias have proven themselves to be perennial, even where the soil freezes. These new beauties will please gardeners everywhere with their bold color and easy to handle sizes. Sangria makes a lovely focal point, sporting vibrant pinkish red petioles, like a rhubarb plant. A closer look reveals the bluish green tint of the leaves and the purple veins that branch throughout the blade. This lovely, clumping colocasia quickly becomes a focal point.