To deal with the toughest cases, though, you may need to consider using chemical controls. Inc. Physical management Hand pulling or hoeing is your first line of defense against weeds, especially annual and biennial kinds. If you're diligent for several years about removing these before they set seed, their numbers will decline significantly.
Perennial weeds are harder to manage.
Once they've passed the seedling stage, they develop rhizomes, bulbs, tubers, or extensive root systems that aid in reproduction. Pulling usually doesn't remove these underground structures completely, and the weeds can resprout from fragments left behind. Don't leave pulled or hoed-out weeds lying on bare ground, since they may take root again. Fortunately, various tools are available to make the job easier. To get weeds out of cracks in pavement, use a screwdriver, weeding knife, or putty knife.