Undergrowth
Encyclopedia
Undergrowth usually refers to the vegetation in a forest
Forest
A forest, also referred to as a wood or the woods, is an area with a high density of trees. As with cities, depending where you are in the world, what is considered a forest may vary significantly in size and have various classification according to how and what of the forest is composed...

, which can obstruct passage through the forest. The height of undergrowth is usually considered to be 0.3 – 3 m (1 – 9 ft.). Undergrowth can also refer all vegetation in a forest, which isn't in the canopy.
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