Trish, sorry this took so long, but I had to jog my memory of my college days in Flagstaff, Arizona. Sambucus forms flower buds in late summer, so any pruning from then until it blooms in late spring will cut off the future flowers. It is best to prune it right after bloom. If you changed your pruning practices last year, that could account for the poor showing this year. Alternatively, the ferocious frost you folks had last winter may have killed the flower buds, too, leaving it barren this spring. The same thing happened to a lot of Hydrangeas in the UK, too.