bout the Spiraea - Van Houtteis :
The Spiraea Van Houttei's, Spiraea vanhouttei, has a foliage color of a dull bluish green. Flowers are white in April-May, borne in many flowered 1-2" diameter umbels. Outstanding deciduous shrub that is very showy in flower. Van Houtte Spirea is a durable and familiar shrub.
Best growth occurs in a sunny location and any garden soil. The flowers are produced in spring after the leaves. The plant grows rapidly and may be used as a screen.