I started my Hyacinths off in November; in a cool, dark place until they started to show through. Speaking to a lady at my garden centre she suggested waiting until the flower started showing through not just the leaves so this is what I did.
I checked them on an off through November with no success and it was actually late December before anything started showing and early January before the flowers began to show at which time I bought them indoors.
Finally, earlier this week the flowers finally opened and I have to say they are the best I have ever managed to grow indoors. They look lovely and they smell amazing! A bit late for Christmas but well worth the wait.
In future years I will be planting the bulbs earlier and will wait until the flower begins to show before bringing them indoors.