I moved into a house with an amazing Magnolia in the front garden, it stands rougly 15ft tall. It is wrapped heavily with Wisteria, it looks like it is restricting the trunk of the Magnolia and the growth of the tree is becoming patchy, possible due to the weight of the Wisteria. The Magnolia is still growing and flowering its just there are large gaps where the tree just hasnt grown.
I would like to keep both healthy but if necessary I would choose the Magnolia over the Wisteria. How do I save them and keep them healthy?