Long Wood Planter Box Building Guide

Building a long wood planter box is a great way to add some greenery to your outdoor space while also showcasing your DIY skills. To get started, you'll need to choose the right type of wood for the project, and according to our research, cedar and cypress are excellent options due to their resistance to rot and insects.

A typical long wood planter box can be anywhere from 6 to 12 feet in length, making it perfect for adding a touch of elegance to a long stretch of fence or a large outdoor area.

To ensure your planter box is sturdy and can hold the weight of soil and plants, you'll want to use 2x6 or 2x8 lumber for the frame. The thickness of the lumber will also help protect the wood from warping and cracking over time.

The design of the planter box is also crucial, and we recommend using a simple rectangular design to make it easy to build and maintain. This design also allows for good air circulation, which is essential for healthy plant growth.

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To get started on your long wood planter box project, you'll need to prepare your materials. First, choose a rot and weather-resistant wood like Cedar, which is a great choice for outdoor projects.

Cedar is a great option because it's durable and can withstand the elements. Alternatively, you could use pressure-treated lumber or another outdoor-friendly wood like Redwood or Ipe.

To keep costs down, use rough-sawn cedar 2x4s for the frame, which have not been sanded. Look for boards with as little twist and bend as possible when choosing lumber from the store.

You can sand the boards to 180 grit using a sander to get them nice and smooth. Start at 80-100 grit and work your way up for the best results.

For the slats on the sides, you can use 3/4" cedar fence pickets, which are usually pretty rough looking but work great after a bit of sanding.

Cutting and assembling is a crucial part of building a long wood planter box. To cut the frame parts and slats, you'll need to cut four legs and two top bars from cedar 2x4s to specific lengths, such as 34.5" for the legs and 30" for the top bars.

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You'll also need to cut eight long slats and eight short slats to size, with the long slats measuring 53" and the short slats measuring 27". Ripping down cedar fence pickets to 4.5" wide on a table saw can also be useful for adding a nice detail to your planter box.

Assembling the long sides involves attaching four long slats to two legs, making sure the back of the slats lines up flush with the back of the legs for a 3/4" reveal on the front. Using a piece of wood to shim the slats can help with alignment.

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Cutting the frame parts is a crucial step in building your project. The legs are 34.5" long and the top bars are 30" long, so make sure to cut them to size from your cedar 2x4s.

To get accurate cuts, it's essential to use a precise measuring system. The legs and top bars are cut from the same material, so take care to cut them evenly.

The frame parts are the foundation of your project, so take your time and ensure they are cut correctly. There are six pieces of the frame: four legs and two top bars.

Using the right tools can make a big difference in the cutting process. A table saw is ideal for cutting the slats to size, as it allows for precise and efficient cuts.

There are eight long slats and eight short slats, which need to be cut to 53" and 27" respectively. Make sure to measure twice and cut once to avoid errors.

Cutting the slats to the right size is critical, as it affects the overall structure of your project. The long slats are 53" long and the short slats are 27" long, so be sure to cut them accordingly.

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Assembling panels is a crucial step in building your planter box. It requires precision and patience, but with the right techniques, you can create sturdy and long-lasting panels.

First, mark up the bottom edge of the bottom board 1 ½” from the bottom edge, which will indicate where to leave the gap for the 2x6s added later. This will ensure proper spacing and alignment.

Using a t-square is essential to keep things square during the assembly process. This will prevent any errors or misalignments that can compromise the integrity of the panels.

Attach the 1x2 pieces with glue and 1” brad nails, using ⅛” spacers between each board to maintain even spacing. This will create a strong and stable panel.

Reinforce the panels with 1 ¼” screws to make them more durable and resistant to the elements. This will give you peace of mind knowing your panels can withstand harsh weather conditions.

To assemble the long sides, start by attaching four long slats to two legs, ensuring the back of the slats lines up flush with the back of the legs for a 3/4” reveal on the front.

Joining and adding the various components of a long wood planter box requires some careful planning and execution. To ensure a tight connection between the corners, clamp them together, removing any gaps, and then add some 2” screws through the short side panels into the 1x2 of the long panel.

When assembling the panels, it's essential to use a t-square to ensure things are nice and square. This is particularly important when using ⅛” spacers between each board. You can also reinforce the panels with 1 ¼” screws to make them sturdier and better equipped to withstand the elements.

To add the bottom of the planter box, attach 2x6 pieces to the panels using pocket screws. Make sure to drill three pocket holes into the end of each board and use a jig to set the depth stop collar a little bit deeper than 1 ½”.

To join panels together, start by ensuring the top edges of the panels line up, allowing you to create a lock rabbet joint in each corner.

You can achieve this by assembling the panels with the top edge resting on a workbench, making it easier to align the edges.

Clamp the panels together to remove any gaps, and then add 2” screws through the short side panels into the 1x2 of the long panel.

This will create a tight connection between the corners, allowing you to pivot the panels to snug up the other end.

Add one screw at each corner initially, so the panels can still pivot, and then flip the planter box over to clamp the top ends together.

Insert screws about 1 ⅛” in from the corner of the planter box, ensuring they connect with the 1x2 from the other panel.

The bottom of your planter box is a crucial part, and it's essential to get it right. The bottom is made up of 2x6 pieces, which are attached to the panels with pocket screws.

To cut the boards to length, you'll need a miter saw. The author of the article measured to confirm the length of the pieces needed, and then cut them to size.

It's worth noting that the factory end of the first board should be cleaned up before attaching it to the panels. The author used a miter saw to make this cut.

The bottom pieces are attached to the panels with pocket screws, and three pocket holes are drilled into the end of each board. The author used a jig to drill these holes, setting the jig to 1 ⅜” and the depth stop collar on the bit a little deeper than 1 ½”.

To install the bottom boards, line up the bottom edge of the 2x6 with the bottom edge of the panel, clamp it in place, and drive in a few 1 ¼” pocket screws. The author used pocket hole clamps for the first board, but switched to parallel clamps for the rest due to the dents left in the Cedar.

A gap of about 1 ¼” between each board is necessary for drainage. You don't need to be precise with this measurement, as it doesn't affect the functionality of the planter box.

The author worked their way in from the ends, leaving a small gap and clamping the boards in place while driving in the screws. This ensures a secure and even attachment of the bottom boards.

Adding trim to your project can be a bit tricky, but with the right tools and techniques, it's a breeze. I recommend using a miter saw to cut the trim, especially when working with small surfaces like planter boxes.

Sanding the corners of your planter box flush before adding trim ensures a smooth fit. This step is crucial to get the trim seated properly.

Cutting a 45-degree miter on one end of the trim, then flipping it around and cutting an opposing 45-degree miter on the other end, is the way to go. This technique allows you to get precise angled cuts.

Leaving the trim pieces long at first and then trimming them to final size based on the actual dimensions is a good practice. This way, you can make adjustments as needed.

Using a template to cut the second long piece of trim is a great idea. It saves time and ensures consistency.

Attaching the trim to the planter box with glue and 1 ½” brad nails is the way to go. The 1x2 uprights provide a great spot to drive in nails.

Ensuring the edges of the 1x2s are flush with the outside of the panels is important for a clean finish.

Lining the planter box is a crucial step to prevent dirt from falling out of the gaps in the bottom. Galvanized steel mesh is a great option to line the bottom, as it keeps the dirt in and prevents it from escaping.

You can use aviation snips to cut the mesh to size, and then staple it into place with ½” staples. It's also a good idea to cut away the areas where the mesh comes into contact with the 1x2 uprights, so that the mesh can lay flat.

After installing the mesh, you can add a layer of plastic to line the planter. A 2mil plastic drop cloth is a good option, but it's not thick enough on its own, so you may need to double it up to prevent it from breaking under the weight of the soil.

To ensure proper drainage, you'll need to punch some holes through the plastic with a screwdriver. This will prevent waterlogged soil and ensure your plants stay healthy.

For the finishing touches, you can use a belt grinder or an angle grinder with a flap disc to round over any sharp edges on the steel angle iron used for the legs. This will give your planter a smooth and polished look.

To prevent dirt from falling out of the gaps in the bottom, line the planter with galvanized steel mesh. I used 80 grit sandpaper to give the outside of the planter box a good sanding, focusing on the corners and trim.

First, cut the mesh to size using aviation snips, then form it to fit the bottom of the planter. Make sure to cut away areas where the mesh comes into contact with the 1x2 uprights so it can lay flat.

Overlap the mesh in the middle to ensure a secure fit. I repeated this process on the other half of the planter, making sure the mesh overlapped in the middle.

To add extra protection, double up the 2mil plastic drop cloth to prevent it from breaking under the weight of the soil. Staple the plastic into place after cutting it to size.

Punch holes through the plastic for drainage using a screwdriver.

Applying a finish to your wood project is a crucial step to protect it from the elements. Two coats of exterior dark gray/black latex paint are recommended for the frame pieces, with a third coat on the end-grain for extra protection.

We used a roller to apply the paint, which helps avoid brush strokes and gives a smooth finish. A Spar Varnish is a good choice for retaining the natural color and look of the wood, as we did with the cedar slats.

Three coats of Spar Varnish were applied to the slats, allowing each coat to dry completely before adding the next. This helps create a strong bond between the wood and the finish.

Assembling the long sides of your planter box requires some precision, especially when attaching the slats to the legs. It's easiest to lay the pieces upside down and use a piece of wood to shim the slats so you can line up the back edges of both.

To ensure a sturdy frame, attach the slats to the legs with 1.25" exterior screws, starting with the top and working down. This process should be repeated on the opposite long side.

The bottom rails are attached at an angle to allow for water drainage towards the center. They're positioned 1" from the bottom edge and centered between the batten and the side slats, attached with wood glue and five screws.

The bottom slats support the weight of the soil and dirt, and they're attached with wood glue and one screw on each side. You can use scrap pieces for this part, as long as you cover the majority of the bottom.

Finally, attach the top bars to the frame using pocket screws, positioning them in place first. This step can be a bit challenging due to the limited space, so be prepared to use a long screwdriver if needed.

To assemble the long sides, pre-assemble the two long sides by attaching four long slats to two legs, with the back of the slats lining up flush with the back of the legs for a 3/4" reveal on the front.

It's easiest to lay the pieces upside down and use a piece of wood to shim the slats so you can line up the back edges of both.

Attach the slats to the legs with 1.25" exterior screws, starting with the top and working down all four slats.

Repeat this process on the opposite long side.

The long sides require four long slats and two legs, and it's essential to ensure the back edges of the slats are aligned for a smooth finish.

With the long sides assembled, you'll have a solid foundation for the planter box.

Make sure to attach the slats securely with exterior screws to prevent any movement or damage.

Attaching the slats to the legs is a crucial step, and using a shim can help you achieve a precise fit.

The four bottom rails are used to hold up the bottom slats and ultimately the weight of the dirt and everything inside the planter.

They get attached at an angle so water drains towards the center. There are two on each side.

We raised the outer edge 1” from the bottom and positioned the rail centered between the batten and the side slats.

Each piece is attached with wood glue and five screws.

Attaching the top bars to the frame can be a bit tricky, so it's essential to position them correctly before securing them with pocket screws.

The pocket screws are the best option for this step, as they allow for a strong and hidden joint.

You might need to use a long screwdriver to get the screws in, especially since there's limited space to maneuver.

With the top bars attached, your project is almost complete.

To build a long wood planter box, you'll need the right supplies and to plan carefully. For the frame, you'll need rough-sawn cedar (2x4s) and cedar fence pickets (1x6).

You'll also need exterior screws, wood glue, and exterior black/grey paint to protect the wood and add a finished look.

Here's a list of the basic supplies you'll need:

For the tools, you'll need a miter saw, circular saw, drill, and impact driver to cut and assemble the wood. A Kreg jig and trim router will also come in handy for precise cuts and joints.

Here's a list of the necessary tools:

You'll need a variety of supplies to get started on your project, and it's a good idea to have a solid list to refer to.

Rough-sawn Cedar (2x4s) is a common material used in many projects, and it's often used as the base for more complex structures. Cedar Fence Pickets (1x6) can add a nice touch to your project, and they're relatively easy to work with.

Exterior Black/Grey Paint is a great choice for projects that will be exposed to the elements, and it's easy to apply. Spar Varnish is another great option for protecting your project from the elements, and it's available on Amazon.

You'll also need some basic tools to get started, including a Miter Saw, which is essential for making precise cuts. A Circular Saw is also a must-have, as it's great for making straight cuts.

Here's a breakdown of the basic supplies you'll need:

You can find most of these supplies on Amazon, and it's a good idea to check out the specific products recommended in the article sections for more information.

Having a plan is essential before starting any gardening project, and that includes building a planter box. You can find free planter box plans online to suit your needs.

A planter box can be made from a variety of materials, such as wood, plastic, or metal. For example, cedar wood is a popular choice because it's durable and resistant to rot.

Measure your space carefully to ensure the planter box fits perfectly. You can also use a planter box plan to determine the exact measurements you need.

You can find plans for planter boxes of different sizes and shapes, from small and simple to large and intricate. Some plans even include instructions for building a trellis or other decorative features.

Consider the style and theme of your garden when choosing a planter box plan. For instance, a rustic wooden planter box might fit in perfectly with a country-themed garden.

Free planter box plans can be found online, often from reputable sources such as The Family Handyman or Ana White. These plans usually include detailed instructions and diagrams to help you build your planter box.