It is pretty simple. All soil has seeds in it. If it is untended soil in your yard, it may have hundreds of seeds per sq meter.
So basically the most viable and adapted seeds to whatever weather you are having sprout and grow like crazy. Usually this is not the one seed you planted hahaha. That’s why we call it a weed.
If the weather was completely different, you’d get a completely different set of weeds.
Even if you buy composted potting soil from the store.. that might also contain seeds (although usually fewer cause it was composted).
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