There are a lot of enjoyable aspects about gardening that I would never wish to automate. Harvesting for one, is incredibly satisfying. Weeding, on the other hand, is a task I would gladly give up to a robot. Especially one with lasers.

Popular Science Blog – The Robotic Weed-Puller
The new robot, called the Hortibot, would still need someone to operate it, but would be capable of doing the work of ten people. It could also be equipped with micro-sprayers that would drastically cut the amount of chemicals applied to kill the weeds, reducing the potential for environmental damage.