We had a few yellow flowers last year. Now they are mounds! I think it’s lesser celandine. Apparently they are grown from little bulbules? They can get on your shoes and get transferred around the garden. I used to be on a natural history website where you recorded the date when the flowers come out. It’s clear that spring is getting earlier each year even though it is only changing slowly. Anyway I like these plants. Our garden is quite wild and it’s good to add different wild flowers.