We've got raspberries, blueberries, etc. in mounded beds and that's working really well. The raised bed are for other, mainly shorter, crops I'd like to keep free of grass and weeds. And if I'm putting in raised beds I figure I might as well make them high enough to make my back happy - hence my question about the stability of a bed three blocks high. It seems it's been done with no problems so I'm planning to go ahead. Three rows high with rebar pins set towards the inside.
Thanks for the help everyone.
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