Opuntia spp. or the "Prickly Pear Cactus", was prized by Native Americans as medicine. It grows bright, oil filled yellow flowers. This ethnobotanical contains amino acids, vitamins, carotenes, minerals, organic acids, sugars, lipids, phenolic compounds, betalins, and is believed to have: Anti-cancer effects, anti-oxidant, anti-viral, anti-inflammatory, anti-diabetic, anti-hyperlididemic, and other properties. It can be cultivated from dried cuttings, or fresh. You can stick the Cactus in your Cacti compost standing up, or lay it flat on top of the dirt. Some growers even bury the Cactus laying face down, and pile a thin layer of compost on top of it. Either way, it's very easy to grow and has a vast ethnobotanical history.
Feugang, J. M., Konarski, P., Zou, D., Stintzing, F. C., & Zou, C. (2006). Nutritional and medicinal use of Cactus pear (Opuntia spp.) cladodes and fruits. Front Biosci, 11(1), 2574-2589.