Step 5Line the tray with pond liner
The tray liner you get should be large enough to wrap around all the sides. Since the tray is six inches tall, an extra foot and a half all the way around is good. Don't forget the 2x4 in the center of the tray is going to use of a foot of length.
The liner came from a pet store and was about $1 per square foot.
Tuck it in, and make neat folds in the corners.
If you want the corners to be perfect, leaving the liner in the sun for a while or heating it with a hair dryer will make it easier to mold to the shape of the tray.
You can glue the liner if you want, but gravity, the water, and the plants will hold everything in place.
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