Texas Gardening: Texas Native Plant Pictures ( Cacti & Desert ), 1 by htop

htop wrote:
Smooth Mountain Prickly Pear, Indian Fig, Mission Cactus, Tuberous Prickly Pear,Nopal (Opuntia ficus-indica), Cactaceae Family, naturalized, edible fruit and pads

The tuberous prickly pear, native to Mexico and the southwestern regions of the United States and also found in South Africa, Spain, and Italy, is a trunk-forming segmented evergreen cactus which can grow to to 15 feet tall and to 10 feet wide. However, I have never seen any this large in my locale. They are usually up to 6 feet tall and wide. The large, oblong-shaped, pads have few spines. The old pads form woody stems. It grows very fast and needs lots of room.

Yellow or orange cup-shaped flowers are produced on the perimeter of the pads in spring or early summer. It performs best in full or reflected sun, adapts to various types of soil that has good drainage and is drought tolerant. The pads shrivel during severe drought which indicates a need for supplemental water; otherwise, there is no need to water the plant once established. It is hardy to the mid 20s (some sources list 15 degrees) with low 20s causing some damage to the pads.

For more information, see its entry in the PlantFiles:
http://davesgarden.com/pf/go/56266/index.html

Those are not "tunas" (prickly pears) on this cactus. They are Christmas ornaments.