How to build a raised garden

Materials

  • Four 16-inch-long 4-by-4s* ($15), to act as corner posts
  • Two 4-foot-long 2-by-12s* ($35), for bed ends
  • Two 8-foot-long 2-by-12s* ($65), for bed sides
  • Twenty-four 3 1/2-inch #14 galvanized or stainless steel screws ($5)
  • Twenty-four 1/2-inch #8 galvanized or stainless steel screws ($5); optional
  • Six 12-inch-long pieces of 1/2-inch PVC pipes ($3); optional
  • Three 10-foot-long pieces of 3/8-gauge rebar ($10); optional
  • Three 3- by 5-foot rolls of 1/4-inch-mesh hardware cloth ($40), to deter burrowing animals; optional
  • Twelve 1-inch galvanized tube straps ($5); optional
  • 1 roll bird netting or floating row cover ($25); optional
  • 16 cubic feet of planting soil ($55 if bought in bulk; $85 if bought in bags)
  • 16 cubic feet of compost ($60 for bulk; $85 in bags)
  • Drip-watering system; optional

Total cost: $235 for raised bed with soil (bought in bulk; $290 with soil bought in bags). Prices may vary.

Tools

  • Drill
  • 5/32-inch drill bit
  • Pencil
  • Ruler
  • Shovel or trowel
  • Level (optional)
  • Gloves
  • Staple gun
  • Wire cutters
  • 4 adjustable woodworking bar clamps: 2 short (12 inches) and 2 long (6 feet); optional

*A note on the lumber: For our side and end boards, we selected sustainably harvested “construction heart”—or con heart—redwood that we ordered at a lumberyard. Con heart is cut from the center of a log and is the most rot-resistant. We used boards that are 12 inches wide, giving us a full foot for plant roots to thrive. To save time, we asked the lumberyard to cut the wood to the lengths we needed. (You’ll need a skill saw, hand saw, or table saw if you’re making the cuts yourself. Be sure to measure twice and cut once, as pieces of wood often vary slightly in their listed lengths, and you’ll need the sides and ends of your bed to be exact.)

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Now that you’ve got the previous step’s post-adding technique down, repeat that technique to attach a corner post to the other end of the 4-foot board. Then grab the remaining 4-foot board and attach a corner post to each end.

You now have the two 4-foot ends of your raised bed and are ready to attach the bed’s longer sides: Position the first of your 8-foot 2-by-12 side boards between your two 4-foot bed ends. Make sure the 8-foot board is flush with each corner post (hold them steady with the woodworking clamps—or grab that buddy again), then predrill each board end with three holes and secure it to a post with three 3 1/2-inch screws. Repeat to attach the remaining 8-foot side board to the awaiting corner posts.

Your rectangular bed is now complete!

To give your vegetables an edge on birds and frost, consider adding hoops to hold up bird netting or a floating row cover. If you want to add these three optional hoops, attach their PVC support tubes now (before you fill up the bed with dirt).

Here’s how: On the inside of each of the long (8-foot) sides of the raised bed, evenly space three of your 12-inch pieces of 1/2-inch PVC pipe. Set those pipes upright against the bed sides, making sure that each PVC pipe has a parallel pipe mirroring it across the bed (so each pair can act as support tubes for the hoops).

Secure each PVC pipe upright to the inside of the bed with two tube straps, using two 1/2-inch screws per strap.

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You don’t want to share your vegetables with gophers and moles. If they’re a problem in your area, keep them out of your raised bed by adding a layer of hardware cloth before you pour in your planting soil.

Here’s what to do: Rake existing soil at the bottom of the bed to level it, then tamp it smooth. Wearing gloves, line the bed bottom with hardware cloth, making sure that the cloth is lying flat on the bottom and curving up to touch each side of the bed. Secure the cloth by stapling it to the sides of the bed. Use wire cutters to trim excess cloth and to help the cloth fit flush around the corner posts.

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