We have 5 grand old sycamores on our property and they ate very happy and healthy. My question as we have a multitude of suckers that are reaching 6 to 8 feet tall. What ‘if anything’ should I do?
Are they harmful in any way? Should I just cut them off at the ground? or possibly dig them up and pot them for sale?
You should cut them. This article discusses how: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-sucker-removal-and-tree-sucker-control.htm