Opuntia undulataNative to Mexico, Opuntia undulata grows large green blue segments, distinctly fleshy and flat but uniquely rippled along the edges. Short spines grown amongst sharp bristled tufts from the numerous areoles. Yellow blooms are followed by chunky green or purple red fruit during the summer months. WATERING Water thoroughly and regularly when soil is 100% dry during the spring summer months. Refrain from watering during the winter months. LIGHT