Pinched petals

This is commonly known as Jews Mallow (Kerria Japonica) it flowers nearly all year long and spreads itself all over the place.

The title tells a story - many, many moons ago it's ancestor was growing in next doors garden but poking through our hedge, then one day my friend who shall remain nameless (you know who you are) who is a bad influence said "lets pinch a bit" which we did, and it has thrived in both our gardens ever since. Unfortunately it is no longer thriving next door.