Pothos is a fast grower—glad you found some. Mine is growing from a pot on the floor, climbing up a
ceiling egg crate trellis against the back wall.
To mount one higher up (trailing), you can get some aluminum stock (bar, angle, or channel, whichever you prefer) at Lowes Depot, etc. and some stainless steel sheet metal screws. Cut the aluminum to fit the inside frame, drill a hole at each end, and attach to the frame with the sheet metal screws. Then attach the pot to the aluminum with zip-ties.
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