All weeds can be controlled without weedkillers, but persistent or deep rooted weeds may be very difficult to eradicate. Ongoing control is likely to be necessary. Annual weeds (which only live for a year) and epehemeral weeds (which live for less than a year) are the easiest to control, as they are usually shallow rooted. However, they can scatter seed prolifically, so usually reappear and require further control. Deep-rooted perennial weeds (which die down in the winter and