Improvement consisting in protectimJ and maint~nance of trees and plarrts

When the improvem~nt consists m the protection and maintenanc<!e of timber or frmt trees or of other useful trees or plants not sown or planted by any of the persons mentioned in section 4, or of such trees or plants spontaneously grown prior to the commencement of the tenancy, the compensation to be awarded shall be the proper cost of such protection and maintenance ascertained as provided in section 9.