Minecraft: How to build a Fully Automatic Sugarcane Farm, Tutorial for 1.8, simple, compact - video Dailymotion
Cactus Farm: 32 long & 64 High, creation #11016
Creating Killer Cacti: How to Make a Cactus Farm in Minecraft « Minecraft :: WonderHowTo
Cactus Minecraft Maps | Planet Minecraft Community
My Auto Cactus Farm Minecraft Map
My simple auto cactus farm. What happens is the cactus grows 3 high and triggers the observer, which goes into a double piston extender that pushes the second block into a hopper,
Creating Killer Cacti: How to Make a Cactus Farm in Minecraft « Minecraft :: WonderHowTo