Add 1 tsp. of liquid food coloring to 1 cup of water. Drizzle the colored water onto the soil surrounding the base of a plant. Wait 24 hours for the water to absorb. Apply another identical dose if the color change was not sufficient.
This passage way made with the same shipping pallets could be perceived as a dual natured pallet wood creation. This is a decorative measure, and also a protective measure as well as it would prevent us from some tiny harmful worms and bugs that might cause irritation and inflammation. And the wooden planter is even better than that.