Prickly Pear Cactus For some unknown reason, this cactus bears different colored flowers based on what region it is located in. For example, in California or southern Nevada, the flowers are most often yellow or peach colored. In northern Nevada and southern Idaho, usually the flowers are more often dark red to bright pink. Regardless of flower color, this plant must be handled with care when planting and placed away from high traffic areas. Grow in full sun, well-drained soil with sand or gravel added; place in an area that is watered once every 14 days during heat of summer only. Mature plant is 6-8 in. tall and about 12 in. wide, but roots readily where pieces happen to fall to the ground. This plant is not bothered by rabbits, squirrels nor deer. (Plant 18 in. on center)