Your results may be different than mine, but merely ripping out Tree Of Heaven was in no way sufficient. The entire root mass promptly sprouted a sea of baby TOH's and I had to go after all of those. It took five years to fully tamp it down to the point that now all I have to do is fight new invasions from nearby groves, rather than recurring subterranean invasions. I alternated yanking them out on Mondays, spraying them with Roundup on Wednesdays, and digging them up on Fridays for most of the summer for that entire time, and while I could miss one appointment, missing two sequential ones meant knee-high new sprouts and their accompanying masses of new root stock, prepared to sprout again.