Thanks for the input..........definitely not begonias, not a plant I like. I did plant anemone nemorosa 'wood anemone' seeds......a possibility. As @Fairygirl mentioned they are definitely rhizome/tuberous growing plants.....would they have developed such a large tuberous growth in 12/18 months?. Maybe I was given them last year? I can't recall. Think I'll just plant them and see what flower appears.
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In the sticks near Peterborough
When you don't even know who's in the team
S.Yorkshire/Derbyshire border