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It’s worked on an onion bed I’ve planted a few months ago. So we shall see come harvest time.
I have access to cardboard but I have to go collect it (miles away) pull all the tape off and staples. Then drive it to the plot.
I do use the cardboard a lot on beds and paths. But the wood chip is at the allotment. There’s always tonnes it so it’s just easier to throw a couple of loads down.
Light_EDDed
Interesting technique. If you use old brown cardboard you can have the same effect of killing off the weeds and it will just rot down so you don't have to keep piercing it.