Choose plants suitable for the depth and size of your wooden box. For shallow boxes, choose shallow-rooted plants. Succulents are a great choice for shallow boxes. Also, microgreens or most salad greens will do fine in a shallow box.
Herein, how do you make a wooden succulent planter?
Additionally, how do plants grow on wood?
How do you make a cactus out of wood?
The best way to prevent deck planters from rotting is with a liner. Lining a wood planter prevents water and fungi from contacting the wood. Preventing rotting by separating that which is good for the plants, water and fungi from the wood.
Use a small shovel from the potting kit to fill ¾ of the container with the succulent soil mix. Gently loosen up the roots of your succulent and remove any dead roots or old dirt stuck to it. In the new soil, dig a shallow hole that fits your succulent and slowly put the roots of the plant in the hole.