Spray it with roundup. You need to kill the entire plant all the way to the roots. Pruning it back is not effective control.
When controlling weeds, it's important to kill the plant and roots before pulling out the above ground part. Pulling out a live weed leaves lots of broken off roots in the soil, and every root can grow back as its own new weed in a few weeks.
What happens when hiring a company to get rid of weeds? If they charge a per visit rate, they just pull the weeds out - looks great but also guarantees them lots of income from many repeat visits. If they charge a yearly flat rate, then they use roundup first to minimize their time needed in the future - still looks great, but for much longer.
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