Posted: 06/11/2013 at 18:41
Willow grows almost too easily from cuttings. My grandad's allotment and those of his neighbours have rows of willows where they'd used cut willow to mark the rows. Just stick them in the ground, leave the leaves or remove them. Get a good bit pushed in then it will be more stable. It doesn't really matter how long a willow cutting is. a couple of feet, one in one out would do it. Or more, or less. Willow grows
When you say hornbeam shaped do you mean those fastigiate hornbeams that were popular a few years back?
How sure are you that it's a willow? If you have any doubts post a photo.