When a weed is pulled out, pieces of the root break off. Those will all grow into more weeds. Multiplying the problem.
The solution is to spray with round-up first. It kills the entire weed. Then pull it out a few days later.
Round-up is rendered inert with sunlight exposure. It will not kill anything a day later if exposed to sunshine. Other things like salt, vinegar, etc, remain in the soil and can harm flowers and shrubs when irrigation or rain starts to spread it out, and drive it downwards.
Round-up is a toxic chemical, and no chemicals should be sprayed on your body or ingested. Spray on a calm day.
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