Use a pencil to mark where you will attach the clips. For our box, we measured 1" down from the top and put one in the direct center (10" in from the end) and then split the difference for the two other clips on each side. Once you have them marked as desired, gently hammer a nail, letting it poke out a bit for the clip to slide onto.
We painted the clips with neon spray paint suitable for metal. Then we used trimmed card stock to write the names of the herbs in the box.
(Optional) You can line the box with waterproof tape or plastic. This will keep your box from excessive warping if you are planting items that need regular watering.
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