I have a viburnum (Viburnum plicatum var. tomentosum) in the middle of my back yard. The first few years it was there, it grew, then we had a drought and for the next few years it actually got smaller each year until I thought I had lost it. Then suddenly it started growing. And Flowering. When it flowers it looks like it has snowed on just one plant. It is gorgeous, stunning and everyone would comment on it. This was it in October 2012.
It’s a complete mystery.