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The Cacti Harvester is a farm automation machine from the Forestry mod. It affects an area of 21 x 21 (x 6 high), so it will harvest any cacti within 10 blocks in either direction. It will harvest the topmost block of any cactus grown to its full size within this area, and will automatically place the harvested goods in a chest or pipe placed next to it. It must be powered by a Buildcraft-compatible engine, anything better than a redstone engine will do.
This video demonstrates how to use all forestry farms, including the cacti harvester.