Similarly, I drive 6' EMT (electrical conduit) a foot or so into the ground and span the ends with black plastic water pipe. It's a bit more rugged than plastic pipe and can be used with whatever you have at hand for shade. Large spring clamps work well to hold your shading material in place.
Alternatively, if you have individual pots to protect, cut the bottom off of a larger & taller-sized pot and place over the one you want to protect. The bottom off will allow a couple of hours of sun in, but shade the rest of the time.
