- The optional trellis supports climbing plants like tomatoes and peas.
- Side tables are convenient work surfaces and handles when you need to move the planter.
- Boards protrude at ends or corners. Those “reveals” hide mistakes. If your measurements or cuts are a little off, no one will notice.
- Notched joinery is super sturdy and easy enough for a beginner.
- Lower shelf provides about 8 sq. ft. of storage space.
- Tend your crop without straining your knees or back.
- Pick fresh herbs or veggies a few steps from your kitchen.
- Soil quality is easy to control; just fill your planter with a quality potting mix.
- Creeping weeds can’t sneak into your plot.
- Fewer weed seeds blow in.
- Its height foils rabbits and other non-climbing critters.
- Placed near your house, it discourages shy wildlife.
- Plant diseases are less likely.
- When frost threatens, covering tender plants is easy.
All of the materials are available at any home center. The legs and planter box are made from treated dimensional lumber. The extension tables, bottom shelf and trim boards are made from what’s commonly known as “5/4 decking material” or just “deck boards.”
Take note: Treated lumber is more variable in width and thickness than standard dimensional lumber. We found 2x12s ranging from 11-1/8 in. to 11-3/4 in. wide at our home center. And we found two types and thicknesses of treated decking material: The “premium”stuff was almost 1-1/4 in. thick while the standard was barely 1 in. Keep this in mind as you build and adjust your measurements accordingly.
Lots of articles online claim that it isn’t safe to grow edible plants in containers made of treated lumber. But read closer, and you’ll see that they’re talking about wood treated with arsenic (CCA), which was banned for residential use back in 2003. The treated lumber you can buy today contains no arsenic and is considered safe for food contact and growing food. Some common types of treated lumber are ACQ, CA and MCQ.
Cut the four legs (A) to length, then mark the positions of the upper and lower notches. Set your saw depth to 1-1/4 in., then make a series of cuts no more than 1/2 in. apart. Drive a chisel into the cuts and pry; the little fingers will shear off. Flatten the remaining nubs with a chisel. Grab a 2x4 scrap and make sure it fits into the notch.
Set your saw depth to 2 in. and make a series of cuts near the end of the notch( to create a square bottom). Break out the fingers as shown in Photo 1. To complete the notch, make the long cut. Your saw won’t cut completely through the leg, so you’ll have to flip the leg over and cut from the other side. Note: Your notches should be as long as your 2x4s and 2x12s are wide.
Flip the planter upside down and install the bottom support boards. These support the plywood bottom and provide a decorative touch. Place the rungs in the leg notches and secure them with 3-in. screws. Position the bottom supports (E, F) so they extend about 5/8 in. inside the box and screw them in place. The overhang should be the same on both sides.
Position the planter upright and install the slats for the bottom shelves. Space them about 1/4 in. apart and notch the corners of the outer slats as needed. Drill three or four 1-in. drainage holes about 1/2 in. up from the bottom of each end board. Plop the 3/4-in. plywood bottom into place and secure it with a few 1-1/4-in. screws. Space the shelf slats (G) evenly and screw them into place. Notch the end slats to fit around the legs. Then install the planter bottom.
The lattice panel trellis is an optional but great feature for those wishing to grow plants requiring support.
Begin by ripping a 5/4x6 x 10-ft. board in two. Construct the panel frame (L, M, N), then rip 5/4 x 5/4 stops (P, Q) out of scrap material and secure them to the frame. Cut the lattice to size, set it into the frame and nail it to the stops using 3d nails. Secure the lattice panel to the back by driving screws through the panel legs into the planter box.
I applied a coat of exterior stain to the planter. You can also leave the wood natural and let it mellow to a soft gray. To prevent soil from seeping out the drainage holes, line the bottom of the planter box with landscape fabric, letting it extend a few inches up each side. Fill the planter with soil or other growing medium and get digging.
A lot of the projects I build are of the quick and simple variety. But I’ve discovered one step that makes almost any project, including this one, look more polished: I eliminate all the sharp edges with a router and round-over bit. The softer edges look nicer, prevent splinters and hold finishes better. I used a 1/4-in. round-over bit on this project. A 1/2-in. bit is shown here.