I’ve made a number of these, all different, but this is the recipe my wife liked the most. This one has an internal cross section of 60 cm by 60 cm The simplest variation is to make a slightly smaller one, about 54 cm by 54 cm by turning the mitres the other way round. It doesn’t sound like much but, with a planter 50 cm tall it can make a few kilos difference.
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