But perennial weeds with strong root systems will push through the decaying cardboard after 8-10 weeks, depending on the time of year.ġ You need to keep removing the regrowth (not the deeper roots) with a trowel, every week if possible. If they are annuals and non-persistent grasses, the 8-10 weeks of light deprivation (before cardboard degrades) sees them die and not regrow. It illustrates why we see few weeds, although there may be new seeds blowing in and many of those will germinate. That’s just one example of what we are avoiding with no dig. They do such a good job of holding soil together again, while the biology can heal. As well as biological (mycelial) filaments holding particles together. Probably because the tool has chopped soil into many small pieces and has broken its network of structure/aggregation. I have heard farmers say how “chickweed follows the rotovator”. Weeds are part of soil’s recovery mechanism Any digging out of weed roots stimulates the remaining ones to grow more. Why? If only soil could talk… like all organisms that are alive, it’s happier when not disturbed and damaged. Whichever perennial (or annual) weed you have, mulching rather than attempting to dig out every root means a greater chance of complete eradication. Or if you don’t need the ground immediately, cover with black polythene for six months before laying cardboard and compost. When mulching a patch of strong nettle roots, use extra thick cardboard, even two layers on the ground and underneath compost.
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