When a violation of section 6-2-21 of this code is observed, the city manager shall have a written notice to correct
the condition served upon the owner, operator, occupant or other person growing or
permitting the growth of such tree, shrub, plant or other vegetation. Personal service
of the notice or mailing the notice to the last known address of the owner of the
premises, by registered mail, shall be deemed sufficient service. Any such notice
shall describe the violation, describe the corrective measures necessary and set forth
a time limit for compliance, dependent upon the hazard created, which time limit shall
however not be less than seven (7) days nor more than 30 days from the service of
the notice. (Code 1963, Sec. 39-10)