Cardboard as a mulch

I look at that chart and think that cardboard is definitely my best option in terms of how easy it is to get to, compared to the other materials she mentions.

I laid down thick cardboard (probably thicker than she would approve of, and in big, whole pieces too - not at all three dimensional or torn up), with hoss muck on top and my garlic is growing like the clappers and I have pulled only a handful of weeds out since October.

The cardboard I lay down has never stayed hard, or had trouble sucking up moisture. If I found I'd put down cardboard that didn't, it would be pulled up immediately, because it's clearly covered in stuff that I don't want in my beds anyway.

I think science is really interesting, and I believe in evidence, but you can also make science tell you what you want to hear, and she's not providing evidence, she is only theorising.