If you do want to transform a large area, then it can be done slowly or sections not cultivated covered with thick cardboard or plastic to smother weeds.
It can take up more time than first expected and no-one wants to get disillusioned by turning over a huge space in their backyard to a vegetable garden that they don't actually have the time in their busy lives to tend. If you do want to transform a large area, then it can be done slowly or sections not cultivated covered with thick cardboard or plastic to smother weeds.