Mulch in fall. Hardiness USDA Zone 4-8. Height 4-5ft. Spiraea x vanhouttei First grown in the mid 1800s and still going strong, clusters of white flowers line up alternately along graceful ...

If you have established spirea bushes growing in your garden ... spirea (Spiraea prunifolia), and Vanhoutte spirea (Spiraea x vanhouttei). The problem with these species is that they're not ...