It's Euphorbia lathyris ... aka Caper spurge ... it's seeds were probably lurking in the soil.
It has a milky sap which can burn your skin, especially in bright sunlight, so if you pull it up wear long sleeves and gloves ... and don't get it anywhere near your eyes.
I think it's quite a handsome plant in the right place, but do beware.
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
Mmm. Any plant with exploding seeds can be a menace. Himalayan balsam spreads this way. It started off as a prized garden plant and now to some people is as bad as Japanese knotweed. I would be very vigilant so that it doesn't spread too much. Where the flowers pretty?
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