Opuntia argentina ( Argentina Cactus )
Light green , flat , oblong , lateral joints , raise 2 to 5 inches recollective , limb from the slender stem . In summertime the yellow , gong - shaped , tumid heyday are borne singly on the stem backsheesh and then produce purplish - reddish blue fruit . This genus has the largest rank of sun loving specie . Australia has even ban a few because of their speedy growth ....