How To Make A Tall Tapered Planter From Two Boards For Under $30

Tall tapered planters add vertical interest to any porch, patio, or entryway, but buying them premade can cost a small fortune. When Jenn Largesse of House One spotted a pair of elegant resin planters marked down from $100 to $60 each, she realized she could build something even better for a fraction of the price. With just two standard 2x6x10 boards, some basic hardware, and a clever skim-coating technique, you can construct a stylish cedar window planter box style container that rivals high-end store models. This project requires moderate woodworking skills, costs about $30 per planter, and takes roughly three hours to complete. The secret lies in the tapered walls, which give the planter a graceful silhouette, and the textured spackled finish that mimics the look of resin or stone.

Materials And Tools Required

Before starting, gather all your materials and confirm that your tools are in good working order. Safety equipment including a dust mask, safety glasses, and work gloves is essential when operating power saws and drills. The material list is surprisingly short, which keeps the overall cost low. If you want a more weather-resistant option, consider using cedar or redwood instead of standard lumber, much like the approach used in this cedar planter box for your patio or deck project.

You will also need a miter saw or circular saw for cutting the boards to length, a drill and driver with a pocket hole jig and bit, a straightedge for marking taper lines, a large plastic taping knife for applying spackling, and a cove base adhesive spreader or notched trowel for creating the combed texture. A Kreg AccuCut or a clamped scrap board works well as a saw guide when trimming the tapered edges.

Cutting The Boards For A Tapered Profile

The tapered shape is what sets this planter apart from a simple box. Each wall consists of five boards that graduate in length from top to bottom. The top board is the longest, and each subsequent board gets shorter, creating a narrowing silhouette. Start by measuring and marking your two 2x6x10 boards according to the cut list. Use a miter saw or circular saw to make accurate crosscuts. Label each piece by position so you keep the graduated order straight during assembly.

• Measure twice and mark clearly before making any cuts to avoid wasting lumber.
• Set the miter saw to a square 90 degree angle for straight, clean crosscuts.
• Cut all boards for all four walls at the same time for consistency.
• Stack the cut pieces in order from longest to shortest to keep them organized.
• Sand any rough cut edges lightly before moving to the assembly phase.

Once the boards are cut, you need to create the tapered wall profile. Mark the bottom width of each wall on the lowest board. For a rectangular planter, keep all four walls the same base dimension for a uniform look. Jenn Largesse marked the front and back walls at 9 inches wide at the bottom and the side walls at 7 inches, since the side panels fit between the front and back. For expert insight on how to handle angled cuts and tapered joinery, check out this guide on how to build a wood planter or plain tapered box from ToolGuyd, which covers similar geometry principles.

Use a straightedge to draw a line from the top corner of each side down to the bottom mark you established. This angled line defines the taper. You will cut along this line later after the boards are assembled into walls, which ensures a smooth, continuous taper across all five boards in each wall section.

Assembling The Planter Walls And Structure

Assembly happens in three phases: building individual walls, trimming the taper, and joining the walls together. Each phase requires attention to squareness and alignment for a professional result. The pocket hole method makes this process accessible even for intermediate DIYers. If you enjoy modular planting projects, you might also like this hexagon herb planter build for a double tier garden bed which uses similar assembly techniques.

Phase 1: Pocket Hole Drilling And Board Assembly

Use a drill and driver with a pocket hole jig to drill two pocket holes into one edge of four of the five boards for each wall. Position the holes consistently on the same side of each board. Adjust the jig and the stop collar on the bit to match the thickness of your stock. Before driving screws, confirm that the wood grain of the receiving piece runs perpendicular to the screw axis, since screws driven into end grain will not hold. Set the drill torque clutch so the screw heads sit flush at the bottom of the pocket hole without stripping.

Phase 2: Marking And Cutting The Taper

Once the five boards in each wall are assembled with glue and pocket screws, mark the taper cut lines on both edges of each wall. Use the bottom width mark you established earlier and draw a line to the top corner on each side. Clamp a straightedge or scrap board fence to guide your circular saw. Cut along each line to create the finished tapered profile. Repeat for all four walls.

Phase 3: Joining The Walls

Apply wood glue to the edges of the side walls and stand them on edge. Apply glue to the edges where the side walls meet the front and back pieces. Position the front wall onto the side walls and align everything flush. Drill three pilot holes through the front wall into the edges of the side walls, then drive 2 1/2-inch deck screws. Repeat for the back wall. Check for squareness after each wall is attached. Use leftover lumber to create a ledger or blocking near the top of the planter to support the plant pot or liner.

Creating The Faux Resin Texture Finish

The signature feature of this planter is the textured finish that replicates the look of molded resin or stone. This technique uses flexible spackling applied over the entire exterior surface. The spackling hides wood grain and any minor assembly imperfections while providing a uniform base for the combed texture. If you are interested in other applications of angled and tapered woodworking, see this guide on framing tapered rafters for irregular roof pitches, which explores similar geometry concepts in a different context.

1. Apply a generous layer of flexible spackling to the entire exterior using a large plastic taping knife. Work in small sections, roughly one wall at a time, to maintain even coverage before the material begins to set.
2. Smooth the spackling with the taping knife, filling any gaps between boards and covering fastener heads. Aim for a consistent thickness of about 1/8 inch across all surfaces.
3. While the spackling is still wet, pull a notched trowel or cove base adhesive spreader across the surface in one smooth motion to create a ribbed, combed pattern. Start at one edge and carry the pass across the entire wall without stopping.
4. Clean the notched tool between passes and dip it in water to prevent material buildup that would drag or skip across the surface. Wipe the blade off after each pass for consistent results.
5. Allow the coating to dry completely according to the manufacturer instructions, typically 24 hours. Small imperfections or ridges can be sanded lightly after drying.

After the spackling dries, apply spray paint designed for outdoor use. Use several light coats rather than one heavy application, changing the angle and direction frequently to cover the combed grooves and edges completely. Jenn Largesse recommends a flexible coating formulated for plastic that can expand and contract with temperature changes. This flexibility prevents cracking as the wood and spackling respond to seasonal weather shifts.

Customization Options And Long Term Care

Once the basic planter is built and finished, you have many options to tailor it to your space. Wood choice alone changes the entire look. Cedar and redwood weather to a silver-gray patina over time and are naturally rot resistant, making them ideal for outdoor use without additional finish. For a cleaner modern aesthetic, heat-treated whitewood accepts paint and spackling well while remaining dimensionally stable. For more ideas on dealing with tapered shapes in home improvement, see this guide on tapered edge stainless steel sinks, which addresses similar fit and finish considerations.

If you want to skip the spackled texture entirely, you can sand the wood smooth and apply a vibrant exterior stain or paint directly. Reclaimed barn wood or pallet boards left with their weathered patina create a rustic farmhouse look. Decorative additions such as rope wrapping around the upper rim, mosaic tile accents, or copper sheeting can elevate the planter into a sculptural focal point for your garden or entryway.

For long term durability, add a drainage layer of gravel or rocks at the bottom of the planter before adding soil. Line the interior with landscaping fabric to prevent soil from washing out through gaps while still allowing water to escape. If the planter will sit on a wooden deck, consider installing a plastic saucer or small feet underneath to prevent moisture trapping. For planters that need to move between sun and shade throughout the year, install casters on the bottom to create a mobile garden that can be repositioned as needed. Build multiple planters at different heights for a layered, dynamic arrangement on your porch or patio.

Building a tall tapered planter from scratch is a satisfying weekend project that saves significant money over retail alternatives. The combination of graduated board lengths, angled side cuts, and the combed spackling finish produces a container that looks far more expensive than its $30 material cost. Whether you choose a sleek painted finish, a natural cedar patina, or a rustic reclaimed look, this planter design provides a sturdy and attractive home for your favorite plants. The principles of taper and angle you practice here apply to many other woodworking projects, from crafting tapered porch supports to building custom furniture. With quality materials and careful assembly, your handmade planter will serve for years while adding genuine character to your outdoor space.