What is this and should I dig it up?
I planted a lavatera Barnsley, bought at the local GC, last autumn and noticed afterwards there was another plant growing alongside it. I didn't worry too much as lavatera is so vigorous. But the other plant is very vigorous and I'm wondering if I should dig it all up, replant the lavatera and either get rid of or replant whatever this plant is. I thought at first it might be a geranium but then I worried it might be greater celandine. It doesn't have orange sap, so it's not that. Any help and advice welcome.
Gardening in East Suffolk on dry sandy soil.