small, white flowers in sumptuous clusters along leafy spirea shrub branches

abundance bloom bloomer blooming branches bridal bridalwreath bush cascading clusters decorative dense drooping exuberant floral flowering flowers garden gardening habit hedge houtte inflorescence large luxuriant may novorossiysk ornamental outdoor plant prolific prunifolia shrub small spiraea spirea spring springbloomer sumptuous thriving tiny van vanhoutte vigorous wallpaper white whiteflowered wreath