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This only will keep seeds that are below the card board from germinating. Any seed dropoed into the bed by birds, thrown in by the mower, or blown from the neighbors will still germinate. If not weeded regularly you would have a nice stand of weeds in no time.
This only works if there are no weed seeds ever blown into the bed nor dropped by birds. It also will inherit seeds from wind blown areas that go to seeb.
I have tried this for years and the squirrels and birds just don't care. they still get the melons. Next year I will be growing them in a totally fenced in planter.
Canning and Preserving Class