Possible Clues:

• Dense growth of small trees and bushes
• Manage to capture image in grove
• Bushy area
• Couple of detectives find two types of drugs cut back in an area of forest
• Cut back (a tree) to provide wood
• Thicket cut back to provide firewood and timber
• Cut back trees (for wood)
• Manage to retain photo showing small trees
• Cut back (tree)
• Cut back (young trees)