A more thorough explanation:

Vert

Vert refers to anything that grows and has green leaves within a forest. It can also mean a power given by a king or queen to cut green wood in a forest.

• The trees, bushes, and plants in the forest are all examples of vert.
• The king granted the woodcutter the vert to cut down trees in the forest.

The first example shows how vert refers to the natural vegetation found in a forest. The second example illustrates how vert can also refer to a legal right to cut down trees in a forest.