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  • Writer's pictureDunsmuir Hardware

How to Build a DIY Planter

Author:True Value

Planter boxes for flowers and other plants are great ways to accent your patio, porch, deck, yard, and other outdoor spaces. They complement existing landscape features to help make everything in your yard work together as an attractive and relaxing place.

Before You Begin

There are as many shapes and sizes of planters as there are plants. They can be large enough for small trees and small enough for a windowsill herb or flower garden. Use window planters, trellises, and rectangular planter boxes to add beautiful accents to your outdoor décor.

Put some thought into where you'd like to put your planter and how it will work with your existing design; then decide what kind of plants you want.

Now, roll up your sleeves, and let's get started.

Build a Rectangular Planter Box

This kind of planter is practical for most types of plantings. Because it will be outdoors you must use wood and materials that can withstand the elements. Cedar, redwood, and treated lumber are good choices because they are naturally weather resistant. As long as the wood is treated with some kind of waterproofing your planter should last for years.

Step 1: Start Cutting

Use a circular saw to cut 2x4s into eight 20" L pieces, six 18" L pieces, and sixteen 17" L pieces. Cut 2x2s into four 18" L pieces. Next, use a miter saw to cut two 21-1/2" L pieces and two 24-1/2" L pieces with the ends cut at a 45-degree angle.

SAFETY ALERT! Always wear goggles or safety glasses when working with a saw.

Step 2: Assemble the Sides

Disassembled side pieces of planter Assembled side pieces of planter

Put two of the 18" L 2x4s and four of the 17"

L 2x4s directly beside each other on the ground, making sure the top edges of the boards are flush with each other. The 18" pieces should be on each side of the four 17" pieces. Lay one of the 20" L 2x2s on top of the 2x4s on its short side (perpendicular), centered, and make it flush with the top edge. Using a power screwdriver, drive wood screws through the 2x2 into all of the 2x4s. Put another 2x2 on the bottom edge of the 2x4s and repeat the same process, so that there is a top and bottom 2x2 piece. Repeat this process three more times, until you have four sides.

Step 3: Connect the Sides

Top-down view of connected side panels

Place the edge of one of the sides against the inside face of another side piece. Make the edges flush and use a square to fix the corner at 90 degrees. Drill four screws through the outside face into the edge of the other. Drive two more screws through the other side's face into the 2x2s on the back of the first side. Do this for the other two sides. Make sure that the 2x2s are on the inside. You should now have a rectangular box with four legs.

Step 4: Assemble the Bottom and Top

Bottom view of the assembled planter with bottom boards resting on interior 2x2 supports

Top view of the assembled planter with frame resting on planter walls

Place the 18" 2x4 pieces into the box, resting them on the lower 2x2 piece. Screw these 2x4 pieces into the 2x2s on both ends. Lay the remaining 2x4 pieces with mitered ends as a frame on top of the box. Drive two screws through each end of the 2x4s into the box frame to secure them to the top.

That's it! You're ready to plant. Planter Box: Project Shopping List

Here’s what you’ll need to complete this project successfully.

  • Cedar, redwood, or treated 2x4 and 2x2 boards

  • Circular saw

  • Miter saw

  • Safety goggles

  • Power screwdriver

  • Wood screws

  • Square


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