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Phytolacca americana
Large semi-succulent herbaceous perennial plant growing up to 3 m in height. The plant has a large white taproot, green or red stems, and large, simple leaves. White flowers are followed by purple to almost black berries.
It is native to eastern North America, the Midwest, and the Gulf Coast, with more scattered populations in the far West.
Some parts can be used as food, medicine or poison
Dan is already suggested ID, I didn't know....in croatia lives only one species P. americana, in some parts of country is breeding as decoration plant, but in continental croatia is widespread as weed
I'm leaving this topic open for the Jopy, she is so much into plants ;D I kinda don't understand this sessile things ;D
omg, that' very weird cause I have found it in a intact forest and it's everywhere by the stream.
Looks like P. americana to me, but I don't really know any of the other species. Either way, it's not really native to your area.