I built lasagna type raised beds last year by layering cardboard, newspaper, compost and soil.
I've turned it this spring to see how the layers looked after a year. Amazingly, there were a large number of earthworms and the cardboard layers have been breaking down into a rich soil There was no evidence of newsprint as it had totally composted.
I am planning to build another bed or two but am running late for this growing season.
I've not used cardboard for weed suppression but that is good to know. Thanks for sharing those links.
