DIY Raised Planter Box – A Step-by-Step Building Guide

In the magical season that is Spring, you may find yourself wanting an opportunity to either develop or showcase a green thumb. Whether you live in wide open spaces or in a tiny urban apartment with a small balcony, one way to fit in a bit of growing greenery is to build a beautiful, functional, and fully customizable raised planter box.

DIY Raised Flower Box for Summer

DIY Raised Flower Box-involve kids

Whether you want a flower box, an herb garden, or even a place to grow and harvest your very own vegetables, this DIY project allows you to do it – and as a raised box, it won’t kill your back to plant (and/or encourages the kids to garden alongside you).

DIY Raised Flower Box Project for Backyard

DIY Level: Intermediate

DIY Raised Flower Box-materials

Materials Needed:

  • One (1) 12’ 4×4 redwood post (or four posts cut to 3’ lengths)
  • Two (2) 4’ 1×8 cedar planks
  • Two (2) 2’ 1×8 cedar planks
  • Six (6) 2’ 1×4 cedar planks
  • 2’ wide 1/4″ grid hardware cloth (aka wire mesh)
  • 24 (or more) 1-5/8” exterior screws
  • 16 3/8” x 2” long hex screws and washers
  • Staple gun, ratchet, sander/sandpaper, exterior wood stain
  • Landscape fabric (aka weed barrier)
  • Potting mix or soil + seeds/plants

Equipment Needed:

  • Compound miter saw (aka “chop saw”)
  • Power drill

DIY Raised Flower Box-kids in mind

Begin by measuring your 4×4 post into four equal lengths (if you haven’t done this already).

DIY Raised Flower Box-miter saw

Use your miter saw to cut the post into four equal 3’ lengths. Repeat the process with your other pieces of wood so that you end up with two 4’ lengths of 1×8, two 2’ lengths of 1×8, and six 2’ lengths of 1×4.

remove any type of staple

It probably goes without saying, but remove any type of staple or alien material on the ends of your wood pieces.

miter saw cuts angles

If your miter saw cuts angles, you’re in luck. Simply measure and mark 1” lines from what will be the top ends of each of your 4×4 posts. Set your miter saw at a 45” angle, and make four cuts to each post, rotating the post 90 degrees (to a new side) after each cut.

DIY Raised Flower Box-wood finish

This adds a nice finishing touch to the post-tops, which will be visible with this raised planter box design.

rotate vertically for angle cutting

If your miter saw doesn’t rotate vertically for angle cutting, that’s okay. Measure 1” in from the sides of your post, right along the top edge.

Set your miter saw horizontally

Set your miter saw horizontally to cut 45 degrees, then line up the 1” points with the saw and make your cuts. Do two opposite sides first, then rotate your post 90 degrees. Match your saw blade to the outer cut points, and cut the other two opposite angles.

Complete cutting the tops

Complete cutting the tops of all four posts.

DIY Raised Flower Box-meassure bottom

Lay your 4×4 posts down and measure 31” from the bottom of each post on just two adjoining sides.

measuring tape for each side

Mark on both sides of the measuring tape for each side.

Marking on both sides

Marking on both sides of the measuring tape gives you two points of reference for levelness. What you’re marking is the point at which the top of your 1×8 side boards will be attached.

going to mark two points

On your two 4’ long 1×8 boards, you’re going to mark two points; these are for the hex screws to attach the side boards to the 4×4 posts. Measure 1-3/4” in from the sides of your 1×8 boards, and 1-3/4” in from the top/bottom of the boards.

DIY Raised Flower Box-mark

Make an “X” to mark the precise points you’ll be predrilling for the hex screws.

Line up the top edge

Line up the top edge of the 1×8 board with the 31” mark that you made on one of your posts. Use a drill bit of your choice (example uses a 1/4″ bit) and predrill the holes.

washer then hex screw

Place a washer then hex screw into each predrilled hole.

Tighten up the hex screws

Tighten up the hex screws with a ratchet until they’re pretty tight. Don’t overtighten that the cedar board splits, however. That’s counterproductive.

wood measurement for planter box

1-3/4” is a nice measurement here because a 4×4 post really measures in at 3-1/2”, so that makes the hex screws perfectly centered on the post.

boards are attached to the post

Once both 4’ long 1×8 boards are attached to the posts, it’s time to attach the two 2’ long 1×8 boards. The hex screws that attach these two 1x8s shouldn’t hit the other hex screws. You can make sure of this by holding up a 2’ board next to the post, and holding up the hex screw as well.

Although you want these next eight hex screws

Although you want these next eight hex screws centered on the posts, you won’t be measuring in 1-3/4” from the sides of your boards because you have to factor in the 3/4″ width of the 4’ board that’s already attached to the post.

DIY Raised Flower Box-mark

So your side markings for your 2’ long 1×8 cedar boards will be 1-3/4” from the top/bottom of your board (same as the 4’ lengths) but 2-1/2” in from the sides. (2-1/2” = 1-3/4” [post center] + 3/4″ [other 1×8 actual width])

mark your drilling points

Again, mark your drilling points with an “X.”

Predrill just through the board

Predrill just through the board at this point (as opposed to predrilling through the board and post together). Although these holes are further from the ends of the 2’ boards than the holes for the 4’ lengths, it is still highly recommended to predrill. Cedar is prone to splitting, and this extra step doesn’t take much time but adds a lot of precision and protection from board split.

boards have been predrilled

When your 2’ boards have been predrilled, have a helper hold up the 4’ board attached to the posts. Align one end of a 2’ board with your 31” height line (or with the 4’ board if you prefer; hopefully the alignments are one and the same), and drill a bit into the 4×4 post through the top predrilled hole.

Attach the washer and hex screw

Attach the washer and hex screw into this predrilled hole with a ratchet. Repeat for the other top hole, on the opposite side of this 2’ board.

two hex screws holding

At this point, you should have the top two hex screws holding the 2’ board in place while also connecting the posts into a three-sided structure.

predrill the four holes

Measure, then predrill the four holes on your other 2’ long 1×8 board. You can use the structure as a sort of saw horse, if you’d like. Just take care not to drill into any wood that’s already in use or attached.

Repeat the process

Repeat the process, on this second 2’ board, of attaching just the top two hex screws. This stabilizes the structure, making it much easier to install all the bottom hex screws onto a solid structure with the boards accurately in place.

Predrill the posts

Predrill the posts for the bottom holes on your 2’ boards, then install the bottom four hex screws (two per board).

Measure the width of your planter box

Measure the width of your planter box; it should be 2’ wide. Carefully flip your planter box over so it’s resting on its post-tops.

Buy hardware cloth

Take your 1/4″ hardware cloth (aka “wire mesh”) and get it ready to unroll.

Wear gloves when working

Wear gloves when working with this stuff. It’s safer, easier, and more efficient.

additional length from the inside side

Allow for at least 7” of additional length from the inside side of your 4×4 posts, then unroll the hardware cloth until it reaches the other two 4×4 posts. Unroll at least 7” more, then mark your cutting spot. Use wire cutters (aka “tin snips”) to cut the hardware cloth.

staples from your staple gun to attach your hardware

Throw a few staples from your staple gun to attach your hardware cloth to what will be the bottom edge of your 4’ long 1×8 sides. Only staple near the center of the planter box at this point, just enough to hold the hardware cloth in place while you work out the corners.

Run your extra hardware cloth

Run your extra hardware cloth up one of the 4×4 posts to determine where you should cut to work around the post.

Begin with a short snip

Begin with a short snip in from the side, up to the corner of your post.

end of the hardware cloth

Next, snip from the end of the hardware cloth along the corner of your post down until you reach the same horizontal point as your first snip (which should be even with what will be the bottom edge of your 1×8 board).

Repeat for the other post

Repeat for the other post on this end of the planter box so that you can flatten the inner part of hardware cloth, between the two posts.

DIY Raised Flower Box-flap

Carefully fold the newly cut corner “flap” downward along the post, into the inner portion of your planter box.

Bend the wire cloth

Bend the thin portion of the flap so that it touches the side board.

inside of your planter box

Once the flap is folded and in place on the inside of your planter box, staple the edges of your hardware cloth all the way up to the 4×4 post. Repeat for the other flap on this side of your box.

With your hardware cloth stapled

With your hardware cloth stapled into place, you can more easily work with the inner portion, between the two posts. Fold it so it will tuck up inside the planter box.

Push the hardware cloth down

Push the hardware cloth down so the fold is even with what will be the bottom edge of your raised planter box.

flip your box back to upright

This is what your box will look like at this point. Repeat all these steps for the other end of your box, so that you can flip your box back to upright and continue working on it that way.

massive amounts of extra hardware cloth

Because you don’t want massive amounts of extra hardware cloth poking out of your box, to rust, snag, or cause hurt, it’s time to trim. We’ll start with the first folded flaps near the box post. You only need to keep enough to staple securely, about 2”.

Repeat for the flaps on all four posts

Trim the flap to about 2” high, and throw the rest away. Repeat for the flaps on all four posts.

Staple what’s left of the flaps

Staple what’s left of the flaps securely to the posts or planter side boards.

hardware cloth are short enough

If the ends of your hardware cloth are short enough (anything shorter than 4” is probably fine), go ahead and staple it to the 1×8 end boards.

your hardware cloth are longer

If the ends of your hardware cloth are longer than you want, it might be easier (and less sharp) to simply fold them over and staple them. We found it easiest to carefully tip the planter on its side to do this.

Fold the ends of the hardware cloth

Fold the ends of the hardware cloth over so that the ends are sandwiched between the rest of the hardware cloth and the side board. Staple in place.

hardware cloth is completely secured

When the hardware cloth is completely secured and in place, it’s time to support it with some 1×4 cedar boards. Flip your planter box over to rest on its post-tops. Lay out your six 1×4 boards evenly.

Predrill each

Predrill each 1×4 support board as it rests in place on the bottom of the 1x8s. The hardware cloth will be sandwiched between these two boards.

Grab some exterior screws

Grab some exterior screws. We had 1-5/8” handy so used those, but anything over 1-1/4” would probably be fine.

DIY Raised Flower Box-predrill

Screw in your screws to the predrilled holes.

Sand process for wood

Sand any obvious rough spots, such as the ends of your 1×4 boards.

want to sand the post-tops

If you want to sand the post-tops (which is recommended), it might work well to use an older bit of sandpaper, so you smooth the wood but don’t take off too much of your cuts.

Lightly sand all other edges

Lightly sand all other edges and corners and surfaces as you want.

DIY Raised Flower Box - wire

Congratulations! It’s built! The hard part is definitely over.

outdoor-friendly wood

Although you’ve (hopefully) used outdoor-friendly wood, like cedar and fir, you’ll still do well to treat the wood to withstand the elements and last longer. We used Australian timber oil in Mahogany Flame to stain and protect this planter box. Let it dry, then move it to the place in your yard, balcony, or deck that you plan on using the raised planter box.

staple breathable landscape

Cut, fold, and staple breathable landscape fabric (aka “weed barrier”) to the inside of your planter box.

help to keep your soil in the box

Although this step (adding landscape fabric) is optional, doing so will help to keep your soil in the box while allowing excess moisture out of the box.

Grab a big bag of potting mix

Grab a big bag of potting mix or soil of your choice.

DIY Raised Flower Box-fill

Fill your planter box about 2/3 full.

DIY Raised Flower Box-colorful rocks

At this point, the raised planter box is yours to do with what you want. Throw some vegetable seeds in there, plant a few flowers, section out some herb plots, whatever. As for our raised planter box, it was to be a flower box shared by two of our young daughters, who wanted their spaces divided and designated with rocks they had painted during the “boring” part of construction.

DIY Raised Flower Box-kids planting

They chose a variety of flowers to incorporate – marigolds, petunias, pansies, geraniums, zinnias – and placed them lovingly and carefully. The raised planter box design is fantastic for this!

might look a hodge-podge this year

When all is said and done, it might look a hodge-podge this year, but the raised flower planter box is a pride and joy to all members of our family.

DIY Raised Flower Box - colorful flower

We love how it brightens up a currently colorless corner of our yard.

DIY Raised Flower Box Project

The box is tucked away between a backyard shed and some raspberry bushes. The mahogany flame hue looks fresh and bright in this setting.

DIY Raised Wood Flower Box

Next we will run a drip hose discreetly up into the box so the flowers have an actual shot at life. Otherwise, well-intentioned as we all are around here, relying on manual watering methods, there’s really no hope for flora survival.

DIY Raised Flower Box

This is a wonderful addition to a backyard, a front yard, a side yard, or even a deck or balcony. The raised planter box design is easy on one’s back and just different enough from other flower beds or herb or vegetable gardens that it’s eye-catching and a treat to look at. We hope you enjoy making your own and growing the things you love.

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