Raised beds have been in existence over here since at least medieval times and, in some cultures, they go back a few thousand years BCE.
As my soil is a fertile, friable loam with good additions in the past of organic matter, I just piled the soil in when I made my beds and top them up with a good layer of compost or manure in the off season. If you want a tailored mix, this is the RHS advice “A good general soil mix can be made by combining 3 parts organic matter and 2 parts sharp sand to 7 parts topsoil”
I have used one for the last two years with success. I used soil from my garden plus a top up from my compost bin. I have managed to grow 'carrot fly' free carrots the first year but not so good last year.
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As my soil is a fertile, friable loam with good additions in the past of organic matter, I just piled the soil in when I made my beds and top them up with a good layer of compost or manure in the off season. If you want a tailored mix, this is the RHS advice “A good general soil mix can be made by combining 3 parts organic matter and 2 parts sharp sand to 7 parts topsoil”
track so thank you all.