Newspaper or cardboard will prevent any grass and weed
seeds from germinating, but unlike fabric, it will decompose after about 18 months. By that time any grass and weed seeds that were present in the soil will be dead. It’s green, it’s cheaper than fabric, and when you decide to remove or redesign the bed later on, you will not have the headache you would with fabric. I've been using this technique for years.
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