Hello. Lots of this popping up around the garden and would like to know what it is; flower or weed? Seems like a ground covering thing; feels like forever clearing but maybe should let it go? Thanks.
Oxalis corniculata (creeping wood sorrel) which can be a real nuisance and is best kept on top of. The seed capsules 'explode', scattering seed far and wide. Some advice here:
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live with it quite happily!