(Question)
A “Tree of Heaven” was removed from our property line late last fall, the stump and roots were not removed. It is an invasive species with an unpleasant odour and smaller branches that drop in the fall. From what I understand, the tree will continue to send out shoots over a large area as well as toxins to kill off competition [as it has done for many years]. What can we do to eliminate the reproduction of the tree?
(Answer)
You are correct, this Tree of Heaven, Ailanthus altissima, is a very invasive plant and requires patience and vigilance to eradicate it from your property..
https://www.torontomastergardeners.ca/askagardener/controlling-motherwort-and-tree-of-heaven/
You may want to consider having an arborist look at grinding the stump out.