Is it possible to transplant a forsythia plant that is about 15 feet wide and has been around for well over 60 years? Even if a section can be cut to be transplanted. How do I do it and what special fertilizer might have to be bought. In other words step by step in detail. It is being taken out to build a new house for my neighbor, and I hate to see it go.
Forsythia are very hardy plants and can take a lot of abuse. Even if you used a backhoe to dig most of the root ball out in one bucket, it probably would survive. You would need to trim branches back by at least a third. Even consider thinning it by cutting a third of the main branches off at 6-10" from the base.
They are amazing plants and only usually take one season to recover whatever you throw at them.
There is a lot of information on line about them, but you will note that people have lots of different ideas.