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I'd not use them, you run the risk of them inhibiting root growth and they'd block water which would possibly rot the wood. If it were me, I'd put the gravel at the bottom, to facilitate drainage, then just top up with soil.
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I think your long sides may bulge when filled if you don't have an external stake driven in halfway along.
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I'm with @Constable_Savage, don't think that long side looks strong enough to hold a lot of soil, Ben...
I put a double layer of liner over a layer of sand under our veg beds, weeds still made it through... 🙄
andyp
Constable_Savage
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@punkture
So I've reused my old shed for some raised beds. I have some old concrete blocks lying around and a load of gravel.
My question is, should I put the concrete blocks in the bottom of the raised beds, then cover with gravel, then put soil on top or would it be better to just fill with soil, or just have gravel for drainage then soil?
I've looked on the interwebz and am still unsure
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