You can buy these at Home Depot or similar store for about 55 cents each. For each 4X4′ box you’ll need 6 pieces of this wood lath. It’s perfect because it comes in 4′ lengths. Then mark off each grid at the 1 foot line-you can see them in the first picture. So each 4′ piece of wood lath will have 3 marks on it-1 at the 12, 24, and 36″ measure. Then it’s just a matter of putting 3 grids on the bottom, and then the remaining 3 grids perpendicular to them, lining up the holes, and screwing them all together. These are bought from the store in their natural color but I paint mine white. It’s a personal thing-I like my grids to stand out. Now place your grid on the garden box and you’re ready for the last step. And you don’t need to nail them down. I don’t and they’ve never been blown off. There are several reasons for the grid but the primary one is that it breaks up your 4X4′ box into 16 equal squares. Each one of these squares will hold something different. If you don’t have a grid you’ll be tempted to do the same thing you’ve always done in your garden-you’ll start planting in rows. Your grids can be made out many things. I like wood because it lasts the longest. I bought all vinyl many years ago and after 3 years they all broke from brittleness. I think I just threw away my original white wood grid a few days ago. It lasted me for 15 years.[ois skin=”below post”]