Pulling weeds out by the roots does not work for everything. Some of them can regenerate from little tap left behind bits of root.
Check out the Pennywort. I had this crap in my lawn and thought I could get it out by hand. I spent a whole saturday pullng it out bit by bit to find it totally engulfing my lawn the next weekend.
Trust me. Cut some off and take it to a local nursery. (Home Depot doesn't count).
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