Building A Custom Flower Box

What You'll Need
4 X4'x 1/4" pressure-treated plywood
Electric Screwdriver
1/4-inch drill bit
Plastic Liners
Potting Soil

You can buy a flower box at gardening centers, but it is just as easy to build one. Creating your own flower box is not only inexpensive and fun, but allows you to customize it however you like. The following steps will walk you through a simple flower box construction.

Step 1 - Determining the Size of the Flower Box

Before you begin building any outdoor planter, you have to determine the size. First, decide where you want the box to go or, if you are planning on making multiple boxes, where they will each be placed. Next, measure the length of the area where the flower box will be resting. Now, consider how wide you want the flower box to be and how deep. For this example, make a flower box that is 10-inches long, 5-inches deep, and 4-inches wide.

Step 2 - Transferring Measurements

With your measurements now being known you are ready to transfer them to the plywood. First, use your ruler and carefully draw out the following dimensions (we'll be using our example measurements):

  • 2 10-inch long by 5-inch wide pieces (Long Sides)
  • 1 10-inch long by 4-inch wide piece (Bottom) 
  • 2 5-inch long by 4-inch wide (Short Sides)

Step 3 - Cutting and Preparing the Pieces

Now comes the more delicate part of the project. First, use your saw and begin cutting out all of your pieces. Next, sand them down to remove any rough edges and imperfections. Now, test fit each of the pieces together to see if they are a good fit. Continue on otherwise sand the pieces again until they make a nice fit.

Step 4 - Assembling the Flower Box

With the dry run down you can now assemble the flower box. First, lay your bottom panel down then attach the long side panels to it. Next, attach the short ends to the flower box. Finally, drill five rows of three small holes each in the bottom of the flower box.

Step 5 - Customizing the Flower Box

Now you can customize your flower box. First, paint the box any color you want but use exterior paint unless your flower box will be inside. Next, use stencils or a fine paintbrush to make designs on the outside of the flower box. You can also antique the box with white paint then scuffing it with sandpaper and a hammer.

Step 6 - Planting

If you want to keep your plants in the store containers you can simply put them in the flower but if not then read on. First, line the flower box with plastic planter liners that you have cut and trimmed. Next, fill the planter halfway with potting soil. Now, transplant your plant from the store container to the flower box. Next, cover the roots with about an inch of potting soil. Finally, water the plants and enjoy them as they add beauty to your home.