Flower boxes are decorative gardening spaces that can add charm to your home or landscape. You can make a simple wooden flower box with treated wood boards and decorate it to complement your interior or exterior décor. Treated wood works well for making flower boxes as it resists mildew and insects. Copper foil, paint and tiles are among your decorative choices for the outside of the flower box. Look for supplies to make and decorate a flower box at your local home improvement stores.
Have a sheet of 1/2-inch thick treated plywood cut into three 12-inch square panels and two 11-inch-by-12-inch panels at the home improvement store. The first three panels are for the bottom and two of the sides of your flower box. The two 11-inch-by-12-inch panels are for the remaining two sides. Your flower box will be 12 inches square all the way around and you need to account for the width of the plywood on two of the sides.
Mark the 12-inch square panels A, B and C. Mark the remaining two panels D and E.
Attach panels B and C perpendicular to panel A with decking screws and construction adhesive for a sealed fit. Countersink the screws. Panels B and C should be facing each other on opposite sides of panel A.
Attach panels D and E to panels A, B and C to complete your flower box construction. Remember to countersink the screws.
Drill drainage holes through panel A. Flowers need good drainage, so make several holes. Space the holes 4 to 5 inches apart; use a 5/8-inch drill bit.
Cut a piece of plastic liner to fit inside the flower box. Attach the liner to the plywood with a staple gun. Puncture holes in the plastic over the holes you drilled.
Attach four small casters to the outside of panel A, in the corners. The casters will make your flower box portable.
Attach one 12-inch square mirror tile to the outside of each side of your flower box. Use adhesive especially formulated for mirrors; other adhesives will bleed through and discolor your mirror.