Fermis my good man, I believe someone may have beaten you on the ol' ferme des cacti
http://www.minecraftforum.net/topic/607875-the-largest-cactus-farm-known-to-exist-now-with-download/
http://www.minecraftforum.net/topic/607875-the-largest-cactus-farm-known-to-exist-now-with-download/