SilliamWhale
Member
Because weeds are opportunist.
But if you plant spring barley into a mulch which is creating propionic and acetic acid and the like, it isn't going to be very keen to take the opportunity either.
There's a good discussion to be had about how we simply create the weed conditions we deserve and that you can virtually predict what will happen so easily that you wonder why we're even surprised when weeds become problems.