Do you know what kind of hydrangea it is? If not, could you give us a little more information so we know which might grow in your area, such as roughly your location and/or your hardiness zone. Has it flowered before and if so what colour were the flowers? Have you pruned it at all, and if so when? Some only flower on last year's wood, so pruning at the wrong time can remove the flowers. Or if it is one that isn't hardy enough in your area the winter may kill the buds.