If there really was more than one green fruit tree, and all the green fruit trees were the same, then it would depend on Han Mei's own decision.
However, based on Chen Luoyang's speculations of Han Mei's style and experience, if all the fruit trees were in the same situation, she might very well uproot all the trees in one go to ensure that the mission was completed.
Chen Mou could also order her to uproot all the trees at once, but that would not be conducive to maintaining his status as the mysterious demon lord, so he could only make it a little more complicated.
The reason why Han Mei was chosen to do this job was not because of the direct descendant of the Green Bull Temple called Zhao Rimian. The reason was because of Miss Han's style. She could automatically help the "Demon Lord" to cover up any possible mistakes.
If it was that young Taoist priest surnamed Zhao, it would be hard to say.