I have a circular plot about ten feet in diameter, which contains a variety
of plants and shrubs. I'd like to find a device to irrigate it from above,
without watering the surrounding areas. I once saw such a device. It was
simply a vertical pipe with its bottom attached to a base stuck into the
ground in the center of the circular plot, and with a sprinkler head on the
top. It was fed by a garden hose connected at the bottom. It seems simple
enough, but I've ransacked the internet looking for such a sprinkler,
without success. Any suggestions are welcome.

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PT