Manual controls such as hand-pulling and mulching are where to begin when tackling weeds. Hand-pulling has an element of satisfaction that no other weed-control method can offer. It’s also one of the few ways for selective control. Hand weeding is easiest after a soaking rain. With tap-rooted weeds, make sure to get the entire root. Otherwise, any remaining piece will provide sufficient energy for it to regenerate a new plant. A layer of mulch 2 to 4 inches thick is a very effective organic means of preventing most weeds from germinating. To be sure the bagged mulch you buy is free of potentially harmful contaminates such as arsenic from treated wood, check each bag for the certification seal of the Mulch and Soil Council.
Source: diy Network