As for Mo Lan, she was the top spiritual wood that could restore one's divine sense.
With Ling Chuxi's current injury to her divine sense, she only needed a piece of Black Orchid leaf to refine into a pill and her injury would be stabilized. Even if she did not need to study the divine race's cultivation technique, her injury would not worsen. If the Black Orchid was used to refine pills, the injury to the consciousness could be instantly healed without any worries.
If it was just a one-time use spiritual herb, it would not be ranked above the Fusang Divine Tree no matter how powerful its effects were.