This little purple flower with a white centre with five spiralling petals is called a Vinca. It has glossy dark green leaves and sprawls across the ground under dappled shady patches. We used to have some in our garden but I think the shade got too deep and other plants grew over it. We will have to try again. It cheers me to see this purple among the muted colours of helibores and fading tulips. Soon the summer will arrive and the flowers will change again.