@sunflower_avenue could it be valerian? that was my first thought, searched images and here is another of the leaves from the internet: https://wildflowerfinder.org.uk/Flowers/V/Valerian(Common)/Valerian(Common)_2009_06_10_Smardale_726p5.jpg
@sunflower_avenue @luminesce My best guess is that it’s some kind of angelica. The leaves aren’t very distinctive but the flowers are. If you can wait until it flowers you’ll know. https://upload.wikimedia.org/wikipedia/commons/d/df/Angelica_archangelica_spring.jpg
@sunflower_avenue interesting, it looks like lovage meets nettle. Did you give it a smell / taste?
@sunflower_avenue Kind of looks like a type of Aconitum. They can have leaves like this, but also fern like leaves.
Maybe keep it in a pot and wait to see what the flowers are like?
@email@example.com If its stems turn spiky, it um.. reminds me a lot of a weed we get a lot around here...
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