I took a walk round the yard at a place that sells pipe coils for various things. They had loads of different diameters and colours. Smooth and corrugated.
The smooth stuff was thick. probably a bit tough to work with but would last well.
I have never actually done this but I would bash wood pegs into the ground flush.
Drill an inch hole in the top of the pipe and use a big screw and washer and screw the pipe down to the peg. (so the washer is clamping on the inside of the pipe)
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