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So woodchip beds are in my view one of the easiest methods of cultivating mushrooms as there's almost nothing that needs to be done to maintain the bed once it's established. It does require a serious amount of hardwood chips though, we used an entire truckload from my tree surgeon housemate which had to be lugged through the house.
The chip is then laid onto cardboard, mixed with a load of sawdust spawn and then watered in. That's pretty much it, after a few weeks you can start to see rhizomorphs (super thick root-like strands of mycelium) growing everywhere and then a few months later it'll start churning out mushrooms and should continue to do so for a few years with pretty much no maintenance.
We also grew a load of veggie's which were planted straight into the woodchip just out of curiousity and they were all really successful as well so it wouldn't have to be some ugly pile of woodchips indefinitely.
I'd love some more info on your woodchip bed mushie cultivation?