Celandines

Once the garden was a sea of lesser celandines (above picture) to the disdain of hostile former neighbours. We have lost the neighbours (the current ones are delightful) and kept the celandines to places where they are not obtrusive, like this fern corner.

 You can even buy posh celandines - this one has dark, bronze leaves and is called 'Brazen Hussy'. It multiplies in a friendly (not aggressive) way.