The Calla Zantedeschia Red Alert didn't get its name for nothing, as it grows large red trumpet-shaped flowers, surrounded by big green leaves of foliage. In fact, this flower blossoms all throughout mid summer. The flower itself grows to a height of around 20 to 24 inches. Keep in mind that this variety loves moisture, so those in dry climates may find growing this variety rather difficult. However, an area near a lake, pond or other body of water would be the ultimate location for this species. The flower does well in zones 6-9.