Very interesting subject indeed. I've just discovered an article about uses for cacti (especially Opuntias)and it's simply amazing. Just a brief list:
- living fences
- cacti sap used to soothe wounds (similar to Aloe vera
- mosquito repellent (in Africa)
- sap extracts used for chewing gum and candles
- stiffening agent for cloth
- mortar (Mexico)
- fresh pads used as food for livestock and poultry
- used for flavouring dairy products (Mexico)
- and course culinary uses...
- and a lot more...
Check this link to find out more:
http://www.sfc.ucdavis.edu/pubs/brochur ... ypear.html