It didn't take Lin Fan long to collect all of the herbs that were in this place.
The herbs would have resisted, but they had already heard the Phoenix God fragment selling them to Lin Fan. So they had no choice but to go with Lin Fan, hoping that he would treat them kindly.
In hopes of currying favour with him, the herbs that could move on their own pulled themselves out of the ground and went over to Lin Fan on their own. They were hoping that by showing that they could act on their own and by showing a display of submission, they would be able to get closer to Lin Fan.
Lin Fan was certainly surprised since this didn't happen when he met the Dragon God fragment, but he wasn't opposed to this.
After all, his plan wasn't to kill these herbs in the first place.