Apr 14 2011

DIY Raised Bed Garden

DIY Raised Bed Garden

Now that I finally have a yard to call my own, it was time to retire the notion of having container gardens on the back porch, and get a more permanent solution going.  In speaking with my neighbor (who was born in the house 2 doors down), he mentioned he was having some problems in the past two years with his vegetable plants producing well. He had the soil tested and there is some organism or soil balance that is not good for vegetables.

I knew I would have to dig up and till part of my yard to make a garden.  After hearing what the neighbor had to say, I was not interested in planting in the existing soil, so I decided to go with a raised bed.  There are a few big advantages of a raised bed garden.

  • Good drainage
  • Control of the soil
  • Less weeding
  • More accessible (hey, I’m old – if I don’t have to bend as far, that’s a win)

I had a simple design in mind and headed to Home Depot for materials.  Use this as a guide, if you want bigger or smaller, obviously, get less wood. Materials cost me in the neighborhood of $100 and I did this on my own in an afternoon.

  • Six 8-foot 2″x8″ pressure treated boards.  Get two of them split in half into 4′ sections at Home Depot if you can’t find your circular saw (like me). You can also use Cedar or Redwood, but the cost is significantly higher
  • 1 5/8″ weatherproof deck screws. These should be in the same aisle as the lumber or on an end cap near it. I got the box that came with the star bit, makes them easier to drive
  • 3″ weatherproof deck screws
  • Metal strapping and corner braces, these should also be near the decking material / lumber aisle
  • Weedblocker material – black fabric looking stuff that you will find in the outdoor section. I used up a 3’x50′ roll.

You may find that your 8′ boards may differ in length by a little bit.. unfortunately this happens with cheap lumber.  Cut them to length before starting, or trim it up afterwards with your circular saw when you eventually find it like me.  Mike Holmes isn’t coming by to inspect your work, so do what you can to make it look the best.

Picked a spot for the garden, and did a rough layout

Go find a nice sunny spot, the more level the better, but it doesn’t have to be perfect. Lay the wood out on the ground, making sure it’s square,and mark the ground where you will dig.  Once that’s done, start digging.  I dug a trench about 4-5″ deep and layed one of the long sides in the ground, leveled it off, then went around and dug the rest, leveling and squaring it up as I went along.   Once two corners matched up, I put in 2 of the 3″ screws per corner to hold the rectangle form together temporarily.  It doesn’t have to be perfect,  but definitely make sure it’s level and square or it will look goofy. 

Dig in progress. One side at a time, leveling and squaring as you go along. I hope your soil isn't as rocky as mine!

Once all four sides are done, you should have a nice wooden rectangle sunk into your yard, screwed together at the corners, with a pile of dirt somewhere.  I just threw the dirt back in the middle, it will mean I’ll have to use less topsoil for fill later on.  Double check that everything is level, all the way around, and square (diagonal measurements corner to corner should be the same or close).  To level, add or remove dirt where necessary, and tap the wood down into the ground with a mallet so that it won’t settle later.

Trench done, rectangle together

After you take a break and admire your accomplishment, the rectangle has to come out of the ground. I flipped it up in the air and laid it next to its permanent home.  Once out, I lined the trench with the weedblocking fabric, and then put the rectangle back down on top of it for the last time.  Be careful with the fabric, the stuff I got ripped pretty easily. Make sure you leave at least a foot or two of overlap towards the inside of the bed, because you will tie this in with some more of the fabric later on.

Weed block fabric is down, underneath the wood and overlapping the inside of the bed

Install your corner bracing from the inside with your 1 5/8″ decks screws.  Also, make sure there are at least 2 3″ screws through each corner face. 

You can now start backfilling the inside of the bed towards the wood. Make sure you get the dirt under the weedblock fabric, we do not want any of the crap dirt below to be in contact with the good dirt we will add later.Once everything is filled in nice and tight from the inside, cover the rest of the exposed dirt with the weed block fabric, overlapping the border you already have. It should look like the picture below.

Screw all of the strapping material into the bottom half of the rectangle, then place one board at a time on to the second floor of the bed and screw in from the inside.  Check for level and square as you go before tightening.  Screw in all strapping, corner braces, and each corner face (3″ screws for corners). The more the merrier, get it nice and secure.   Try not to pass out from being upside down with the drill when you finally stand up from the blood rushing out of your head.

Weedblocker fabric in place

 

All secure - ready for soil!

 

And that’s about it for construction.  All you need to do now is backfill your trench, and fill up the bed with soil.  You will need to do some math on the size and depth of your garden to figure out how many cubic feet of dirt you need – in my case it was about 1.4 cubic yards. The picture at the very top of the page shows what 800 pounds of topsoil in there looks like (40 pound bags are 98 cents at lowes and home depot for the cheapo stuff).  Fill the bottom 2/3rds with cheapie stuff, then get some nice potting soil for the top layer.

Next step ….. irrigation

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