Definitely a tree peony seedling. There must have been a parent plant nearby at some point. Have you moved in recently? They can take a year or more to germinate so perhaps there was one there in the past.
My other half - who isn't great with plant names - reckons there was a peony there at one point but I honestly can't remember it. Also the one from the first picture (the one I pulled up with the tuber) was from the other side of the house ... 50 metres aaway ...
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It’s in the compost heap now as I thought it was a weed!
There are loads more out the front bursting through my thick layer of weed protection mulch ... is this an aggressive plant?
My other half - who isn't great with plant names - reckons there was a peony there at one point but I honestly can't remember it. Also the one from the first picture (the one I pulled up with the tuber) was from the other side of the house ... 50 metres aaway ...
The above is a 1st year seedling I found on the interned hope it helps.