hiya, and welcome
we dig pits for cucumbers, squash and runners overwinter, we fill the cuc and squash pits with muck,and cover with the soil we took out, it rots down over winter,
the runner bean trench we fill with all the veggie bits, crumpled newspaper and some unrotted muck, when it's full, we cover it over and it sits there 'til the beans are ready to go in ;D