Pruning witch's broom gingko
I have a gingko bought from a local nursery that was labeled "witch's broom" - no named variety was given. It's been planted for five years and is about eight feet tall. It grew rapidly the past two seasons, and after the leaves dropped this fall, I noticed that it has developed two strong leaders and seems to be outgrowing its witch's broom form. Can anyone recommend a way to prune it back to maintain its current form and height?