Spirit Plants.
In the Cultivation World, they are a valuable resource not inferior to "Spiritual Energy."
Consider the Foundation Establishment Pill.
Without this pill, no matter how good one's talent is, the impurity of the nature's spiritual energy would prevent the transformation of the flesh, resulting in an inability to build a foundation.
The value of spirit plants is often related to whether they can be cultivated, their quantity, and their age of growth.
Generally speaking, the older the age, the more nature's spiritual energy a spirit plant absorbs, similar to the concept that the older a "cultivator" or "spiritual beast," the higher their realm; thus, the medicinal effect is better.
For normal second-tier elixirs, the main materials typically require two hundred to five hundred years, while the auxiliary materials need only several decades.
