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I don't have much experience at this allotment/vegetable/herb growing.Anyway, in my experience, double dug beds aren't worth the work. It's like the marathon run or English channel swim of gardening. Bragging rights for over achievers. Or masochism. I never noticed any real increase in what grew from a double dug or once dug garden.
What I do know without ever having to lift a fork or spade is dig depth should be governed by ground conditions. We had a vegetable garden in Catalonia; a large one. Yup, stuff was growing when I got there but nothing like the other local vegetable plots. I dug that garden, 800mm deep at some points. It took me ages. The reason this vegetable plot was underperforming was about 30cm down (variable) was a thick layer of clay and below that rubble that had been used to extend the natural rock spit the house and close surrounding were built on. The productivity of that particular vegetable garden once deep dug and compost dug in with the broken up clay improved dramatically
At the allotments, it's not clay but stones, about six inches below the surface.
One deep dig all over with compost replacing the volume of stones (barrow load after barrow load some as big as house bricks) I hope will provide a decent starting point and next year I should just need to add compost and give that a light dig in.
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