Cement blocks do not need to be mortared together. They are heavy enough to hold any shape even if you leave the holes empty and you pile the soil very high. Because of their shape and the way they are designed, no soil will escape from the bed at all so long as they are fairly level.
Not adding mortar gives you the option to change bed size and shape each year.
I learned the hard way how important it is to line the bottom of the bed with landscaping fabric (or another impervious layer). I have never seen such healthy weeds...
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