Step 1: Materials
One pair of scissors
One hole poker (pen, pencil, awl, small screw driver, skewer...you don't want the holes too big)
One container for water (cake pan, plastic container, etc.)
Step 2: Stab it!
You are left with two pieces, a flat one and one with bumps. Let's start with the flat piece, or what was once the lid. Using a pen, mechanical pencil, regular pencil, screw, nail, whatever... stab holes incrementally across the lid. The size and spacing should vary depending on the plant you will be using,
Ex. the stems of my lemon balm are smaller in diameter but bushier than the bottoms of my strawberry runners, so the lemon balm gets smaller holes that are further apart so the leaves don't touch and the strawberry runners get larger holes