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Product Name: | Oldcastle 5.5-in H x 7.75-in L x 7.75-in D Tan Concrete Retaining Wall Block in Brown | 16202336 |
Product Description: | Reinvent your garden with the Oldcastle planter wall block. This functional wall block allows you to easily create a raised garden bed, border or even outdoor furniture. Simply stack and link the blocks with 2 x 6 wooden boards. In just 30 minutes you can have your garden built - just add soil or mulch and you are ready to start planting. Oldcastle 5.5-in H x 7.75-in L x 7.75-in D Tan Concrete Retaining Wall Block in Brown | 16202336 |
Product SKU: | 1001156396_1001156396 |
UPC: | 742786309525 |
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Cardboard isn't entirely clean, but it's less contaminating than this, so lining the interior of the bed with broken down boxes (stripped of tape) before filling can help. The bulk of the contaminants will end up running off into the surrounding soil as the cardboard breaks down.
Better still, use untreated wood and put a segment of wood over the concrete on each corner... but untreated wood will frequently rot in 4-5 years.
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Squat anywhere you want!
I'm a big fan of cedar. I actually used cedar fencing for a series of raised beds, but cedar fenceposts are no longer available where I was, nor where I am. Even a half inch thick cedar is fine for a raised bed if you reinforce the outside every 2-3 feet.
I did drive 1/2" x 2 feet rebar through the hole in the middle of these and into the ground for added stability even though I only went 2 blocks tall. I then topped the perimeter with 2x6s on top of the blocks screwed into the wood walls like you see in the example pictures.
Also the Miracle grow raised bed soil is junk in my area (I believe is locally sourced) and mostly just mulch. Better off getting real soil from a local place. Either way you want to mix it with your existing soil.
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You still don't know.
sorry, replied to the wrong comment
Yeah, I'll concede I was relying on outdated information about wood treatment, but even what you get from leaching from standard quick dry concrete (mostly trace metals in the limestone powder used for Portland cement) against soil in higher humidity conditions, taken up by plants and ingested, is usually much worse than the environmental exposure this guy listed here, unless you live in a significantly polluted urban environment... or probably anywhere in Texas, given the shale mining...
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I ended up replacing the corners with 4*4s when I couldn't add rebar