The first one I've seen this year..

Rosebay Willowherb (Epilobium angustifolium).
 
On the breeze my fluff is blown; So my airy seeds are sown.
Where the earth is burnt and sad, I will come to make it glad.
All forlorn and ruined places, All neglected open spaces,
I can cover- only think- With a mass of rosy pink.
Burst then, seed-pods; breezes, blow!
Far and wide my seeds shall go!

Cicely Mary Barker 1925