Steeple bush 

A vigorous upright multi-stemmed shrub. grows well on loamy and sandy wet soils. It is happy to grow in water-logged soils and even quite dry soils, And can be happy in light shade,  Beautiful pink flowers stand out in the Summer ontop of bright green leaves, Best planted where it wont take up too much space as it can take over smaller gardens, 

Site:  Needs some shelter
Position: Full sun, dappled shade 
Soil: Any, 
Seasons of interest: Spring flowers, Autumn colour
Hardiness: Hardy
Height: 5ft (1.5m)  Spread: ?10ft (3m) or more