(Psychological / emotional perspective)
While the obstacles we create for ourselves in life may cause difficulty, vegetation suggests that there is also an underlying abundance and fertility that is available to us.
In dreams, a pictorial image can help us to understand this.
To be clearing vegetation, for instance in a vegetable garden, can suggest clearing away that which is no longer of use to us.
If vegetation is sparse enough in dreams for this to be noticeable there is a lack of emotion or passion in us.