No person shall interfere with the Director or persons acting under his authority while engaged in planting, mulching, pruning, trimming, spraying, treating or removing any tree, shrub or plant in any street, alley or public right-of-way in the city, or in the removing of any stone, cement, plant or other substance from about the trunk of any tree, shrub or plant in any such street, alley or public right-of-way.
('64 Code, § 19-105) (Ord. 390, passed 1-28-71) Penalty, see § 10.97