http://www.potsaa.com/bridal-wreath/

carve out a bridal wreath shrub prevent flowering next year?
My flowers on the bridal wreath was not last long this year, they all disappeared after our first rain. The plant was growing very well, but I want to know if I can cut the bushes to keep in shape without jeopardizing the chances of getting flowers next year.
If you cut now or in the fall, you will cut the buds of next year (as in the lilac). Several times I saw people doing maintenance lawns in summer. Finally, while leafing through the normal yields, and the plant has a more pleasant, but the flowering stems cascade, we hope for next year are gone.
Gardening Tips & Flowers : How to Grow Bridal Wreath (Francoa Ramosa)