Depends on the size. Jayhook has a great method with the idea of keeping the seeds from generating! Once, I lined my garden spot with old newspapers between the rows. Any weeds that had seeds I tried to pull up and bag by hand. I pulled the paper up at the end of the year and replaced it with all of the fall leaves from my yard trees. Did that a couple years and it really helped. My thoughts were that weeds have to have sunlight and I refused to give them any. If you don't have trees for leaves, grab some teenagers who need cash and have them rake an elderly person's leaves. Helps everyone.