The whole purpose of using the RS method (alfalfa hay) is no weeding, no bed prep, no chemicals. The hay serves 3 purposes, mulches, keeps soil from drying out, feeds the worms, which in turn enriches the soil. I have used this method for years .
I am totally organic and use Howard Garrett's method using lava sand, dried malasses, corn glutton meal to fertalize. In recent years the price of alfalfa hay has really gone up so that would make the bed you are talking about really expensive.
