We recently had new mulch put down in our garden beds. Now we are seeing countless new Tree of Heaven sprouts in the mulch beds. I am pulling the plants one by one but wonder if the seeds were in the mulch. Over the past year, we have been working hard to eradicate the Tree of Heaven from our property using triclopyr for hack and squirt and basal bark treatment for the larger plants and full grown trees. These new growths appear to be seedlings, not suckers.  Thank you.