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Take a slow-crawling wheeled lawn bot. Nothing fancy,
probably two independently driven front wheels and a third
trailing caster type thing. Solar powered, probably, and
connected to a hose. The hose should attach to a sort of
elevated swivel tail type thing to minimize the tangling
it can crawl around your lawn in an orderly fashion
dispensing water to the grass. The deluxe model has a soil
moisture probe. Now it can provide more appropriate levels of
water, and not turn that shady bit by the tree into a swamp.
This might be what [bungston] had
Lee Valley doesn't seem to carry it anymore, so Amazon link [notexactly, Apr 20 2016]
||We once had something like this. The cool thing is that the crawling was powered by the hose, which turned something that in turn turned the big spiked wheels.
||I wonder if there's a variant available that monitors soil moisture conditions, time of day, and lighting, and will water and move my bonsai trees in and out of the shade.