If the improvement involves the planting of trees, the petition of the property owners shall specify the kind and character of trees, and if there be a park commission in the municipality the park commission shall approve the kind and character of trees to be planted before the governing authority shall receive and act on the petition. The park commission may install the trees provided that the cost to the property owners will be less than the cost of installation under contract bids.
La. R.S. § 33:3494