The flowers are shaggy white panicles in mid May in my USDA zone 7 garden. Although I've not read that this shrub suckers, I can testify that it does. There are several named cultivars, some with rosy outer petals on white flowers, and one, 'Punctata' with variegated foliage. This is not really a plant for the small garden, although I imagine regular pruning could keep it smaller. Blooms are formed on old wood, so if you prune, you should do so immediately after flowering.
Deutzias are easy from cuttings at just about any time in the growing season.
If you have the space, this is an easy care shrub that seems to have no insect nor disease problems and is not eaten by my local deer herd. Next time, I'll tell you about more of the plants in this garden. See ya' later. More Information Clematis are good vines for shady gardens, most requiring only a half day sun. If you don't grow these lovelies yet, or even if you do, head for the International Clematis Society's web site to learn how to plant them, more about them and see some lovely photographs that will set you drooling for them.