DIY – Island Bed with Retaining Wall Bricks

Island bed? What is that? No, it isn’t a bed with palm trees. An island bed is a bed not connected to anything, such as your foundation or property line. It exists as an island, alone in a sea of grass. This blog post will be about how to make a island bed with retaining wall bricks. Why build it up as a raised bed? Well, in additional to looking better, giving you the opportunity to improve the soil, and improving drainage. You also have to bust up less sod, which is my least favorite gardening task, and I’m sure your’s as well.

Step 1: Draw your shape

DIY - Island Bed with Retaining Wall Bricks

The first thing you need to do is draw an outline for your raised bed. I recommend large sweeping curves, organic shapes. If you want a perfect circle you can do that as well, I recommend cutting a board to the diameter of your circle and using that as a guide. You can use a hose or string or rope to create your shape, but spray paint works best.

Step 2: Put down a liner

DIY - Island Bed with Retaining Wall Bricks

The next thing will be to gather some plain brown corrugated cardboard or a bunch of black and white newspapers and place it in the middle of your new bed on the grass. This material, which is completely safe for the garden, will act as a temporary weed/grass barrier until it decomposes in about 90 days. You don’t want to use a permanent barrier that will block future roots, you just want something that’ll last long enough to block the grass and whatnot.

Step 3: Dig trenches

DIY - Island Bed with Retaining Wall Bricks

The only bit of sod busting you must do is an approximate 10 inch wide trench along the inside border of your new raised bed. I recommend a flat shovel for this as the bottom needs to be flat and fairly level. If you have a sod cutter/edger you can use it to perforate the area into blocks making it easier to pick up the sod. As you dig, flip the chunks sod side down on top of your cardboard. When done, pile bags of composted cow manure (or whatever type of soil you plan on using) inside the bed. I recommend manure because you only get one chance to improve the soil like this.

Step 4: Lay your first bricks

DIY - Island Bed with Retaining Wall Bricks

The first thing you need to do here is unroll some high quality weed landscape fabric in your trench with the excess going towards the inside of the bed. This will line your future bricks on the inside to prevent soil from draining out. Then you can lay your first brick in the trench, level it with dirt if needed, and move along with the second brick. This first row will take the longest.

Step 5: Finishing Laying Bricks and Fill

DIY - Island Bed with Retaining Wall Bricks

Once you get the first row of bricks done, put down a bead of landscape block adhesive and lay the second row (you may need to cut bricks with a chisel or saw to fill in the last one on a row). When you reach your desired height, slash open the bags of dirt inside with a knife and empty them in place. You will probably need to tamp down at the edges.

Step 6: Staple the Fabric

DIY - Island Bed with Retaining Wall Bricks

Fold your landscape fabric in towards the center of the bed, trim off any excess beyond a 6 inch swath around the edges of your bricks. Then secure it to the soil using landscape fabric staples. Your soil is now secure and shouldn’t run out between the cracks in the bricks (too badly anyways).

Step 7: Mulch, Plant, and Enjoy

Finally you just need to mulch and plant your new island bed with retaining wall bricks. You can do different designs and multiple tiers using the same principles outlined above, you’ll see I did two tiers with the example for this blog post. If there are gaps between the front of your bricks and the lawn you can fill it with any leftover soil, or leave them be and they’ll fill in eventually by themselves. You should expect some settling over time on the bed contents as the grass way underneath rots, so feel free to really mound up that mulch.

DIY - Island Bed with Retaining Wall Bricks

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Thanks for sharing this!

1 Response

  1. Rhea

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