Posted: 18/07/2014 at 19:11
One benefit is that a coppiced tree will live much longer than a single trunk (natural lifespan of a Hazel is about 50 years) - some coppiced Hazels are hundreds of years old and another is that you get a free supply of poles and pea supports.
It might be difficult to train one as a single trunk as Hazel's natural habit is to grow as a multi-stemmed shrub/tree. When you need to prune it to keep it within your stated bounds, it is very likely to keep throwing up new stems from below ground, so you'd need to keep on top of that. It's certainly possible though as many young filbert and cobnut trees are supplied that way.