What is this plant with buds?

Question

It's been growing for a few months -- first as a little seedling in my polka dot plant pot, and now I have it outside. When I put it outside, it shot way up and started getting these little green buds. What is it? When it was smaller I thought it was a geranium, but now that it's matured I don't think it is...

Answer 1

As the plant grew, my plant identification app helped me realize that it's a nipplewort.