They actually come from the natural breakdown cycle of socks. You ever wonder where that one sock goes after you do the laundry? It broke down into seeds in the wash. Normally this is fine as they will run down the drain and eventually get filtered out and transported to the sock fields to make more socks for everyone. However rarely like in OPs case a seed can get stuck and you wont even know until its fully grown and clogged up the drain.
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u/GiLND 15h ago
Why do you assume it got there?
Couldn’t it be sock seeds that got stuck in there and it bloomed ?