Polarity

Water Mana and Wind Mana, according to the complexities of Mana Theory, were both considered Yin-aligned Elements. Fire and Earth were the opposite.

Something like wood, being a fusion of Earth and Water Mana, could take on the characteristics of both.

Many old men and women spent countless years of their lives studying these sorts of things, so even Theron wouldn't claim that he completely understood. Also, these sorts of affinities didn't start making real sense until one reached much higher levels of cultivation.

The main point was that plants could take on a path based on their circumstances. If above ground everything looked so bright and inviting, then the concentration of Yin must be below ground.

In which case…

Theron closed his eyes, and his Water Mana shifted.

…