That's some new hipster level shit right there. "Yeah, I get all my produce from a free-range garden. You really get a different flavor between kale that's been listening to the buskers downtown and the ones who are walking along the river."
Chinese roboticist and entrepreneur Sun Tianqi has made it happen: modding a six-legged toy robot made by his company Vincross to carry a potted plant on its back.
Sucking water through the legs sounds like it would break in all manner of amusing ways, and it would need a floor-level water source anyway so it isn't particularly practical. Solar panels could have some merit, but I'm not sure if it could carry enough generation to break even on consumption, particularly considering how many servos and sensors it would need. It would probably be doable if it doesn't spend too much time moving, but it would still probably need another source of power to make up any difference.
It might be more practical to combine both resource requirements into one solution: a charging station it can navigate back to that has a water reservoir on the top, so it can recharge itself every night and water the plant at the same time. You would still need to refill the reservoir, but that would be a weekly (or even monthly, depending on the plant) chore rather than a daily one. It could even be designed to automatically add a suitable amount of fertilizer to extend the time before you would need to repot the plant, which could be handy for longer-lived varieties. It would probably be a bit expensive as a standard feature, but it would make for a great accessory.
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