In general, the elementals of trees tend to adhere to the following rules:

The elemental of tall trees (and occasionally trees with low density wood) tends to be Air.

The elemental of hot climate trees, trees with red berries, trees with reddish wood, or trees with bright red, orange, or yellow autumn leaves tend to be Fire.

The elemental of short trees or trees with high-density wood tends to be Earth.

The elemental of trees that grow in very moist conditions tends ...