I have a contorta tree that is planted in a moderate sized container, with perhaps 2 gallons of soil. We have had the tree for perhaps 8-10 years. My problem is that the tree sends an endless number of suckers from the base. At the same time the main tree has gotten weaker and weaker until it finally died and all that is left are them many suckers that pop up from the lower trung or upper part of the roots. Is this related to a graphing issue? Do all contorta trees send up so many suckers? Is there a way to avoid this issue?
Plant is on the right: