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Minimum landscaping standards are required for development within all zones except agriculture, gravel and grazing, open space, and single-family residential, as follows:

A. Application: The requirements of this section apply to all new development and to the remodeling of existing development where there is an increase in the building’s footprint.

B. Design:

1. All landscape and irrigation designers and installers shall have all required state and local licenses, insurance, bonding requirements, and be able to show proof of such.

2. Landscape plans shall make provisions for erosion control on all graded sites. No turf shall be planted on slopes greater than thirty percent (30%). Turf should be reserved for areas where it is functional, including high traffic play areas, or areas needing erosion mitigation. Choose turf species with lower water requirements. Choose turf configurations for irrigation efficiency.

3. A landscape and irrigation plan prepared by a Utah-licensed landscape contractor or landscape architect shall be submitted to the city for review at the same time as the drawings and plans are submitted for development of the site.

4. Plants that are well adapted to the St. George-area climate zone shall be used.

5. Plants with similar water needs shall be grouped together in “hydro zones.” Spray heads and drip emitters shall not be connected to the same irrigation valve.

6. Drought-tolerant plants with low fuel volume or high moisture content that will blend with the native vegetation shall be used for projects located at the interface between urban areas and natural (nonirrigated) open space.

7. Storm water detention and retention basins shall be landscaped.

8. Landscape plans for projects proposed for development in multiple phases shall clearly specify the landscape improvements required in conjunction with each phase.

9. At least fifty percent (50%) of the required landscaped area shall be covered with foliage of shrubs, grass and live-vegetative ground cover within five (5) years of planting. Trees and the tree canopy shall not be counted in this fifty percent (50%) requirement. In addition to the shrubs, grass, and ground cover, one (1) tree with a minimum one-and-one-half-inch (1½") caliper trunk shall be planted for every four thousand (4,000) square feet of landscaped area with a minimum of one (1) tree per property. The trees may be arranged by the landscape architect as best fits the plan either in rows or clusters. Tree species suitable for desert landscapes are acceptable to meet this requirement.

10. A plan for ongoing maintenance of right-of-way areas shall be included when landscape and irrigation plans are submitted.

11. Ten percent (10%) of a proposed project’s required landscaping may be located on a rooftop or rooftops.

C. Installation:

1. Landscaping and irrigation installation shall be completed as outlined in section 10-1-12.

2. Landscape and irrigation installers shall follow the plans that have been signed and approved by the city.

3. Landscaping shall follow the city of St. George access management policy to properly define the safe-sight distances for intersections or driveways and follow height limitations and zoning requirements.

4. The city may inspect landscaping improvements and require corrective measures regarding the installation of site landscaping and irrigation-system improvements found not to comply with the approved plan.

5. Soil preparation shall be provided to assure healthy growing conditions for the plants.

6. The landscape contractor or irrigation contractor shall provide the city with a letter certifying that all improvements have been installed in accordance with the approved plan and specifications prior to issuance of a certificate of occupancy.

7. All irrigation installers shall be supervised by an irrigation contractor.

D. Irrigation:

1. Landscape areas shall be provided with a permanent, fixed automatic irrigation system installed by a licensed landscape contractor.

2. The distribution uniformity shall be sixty percent (60%) for all fixed-spray systems and seventy percent (70%) for all rotor systems.

3. Decorative water features such as pools, ponds and waterfalls used in landscaped areas shall have a water recirculation system.

4. A water performance audit shall be conducted by a certified water auditor within thirty (30) days following the installation of the irrigation system. A minimum of ten percent (10%) of the irrigation zones shall be audited at the discretion of the auditor.

5. A backflow-prevention assembly shall be properly installed and tested to meet city requirements and meet all state and local health safety laws and ordinances.

E. Trees:

1. All street trees shall be planted and maintained in accordance with title 7, chapter 4 of this code.

2. All healthy trees within ten feet (10') of the right-of-way having a trunk caliper of at least four inches (4") at one foot (1') above the ground shall be preserved during construction unless removal is approved by the shade tree board.

3. Preserved trees shall be credited toward the satisfaction of the tree planting requirements.

4. Trees to be preserved shall be protected and watered during construction with the following:

a. A tree-protection barrier (fence) shall be installed before any demolition, grading or construction begins, and shall not be removed until final completion of the project.

b. The tree-protection barrier shall be erected around the tree with a radius of no less than seven feet (7') unless otherwise directed or approved by the land use authority.

c. The tree-protection barrier shall be constructed of any material substantial enough to protect the roots, trunk, and the crown of the tree, such as:

(1) Three-foot (3') high orange safety fencing on metal posts.

(2) Three-foot (3') high silt fencing staked with flagging.

5. Trees or shrubs that are planted under or near power lines shall not grow above twenty-five feet (25') in height at maturity. Tree trunks and branches shall not encroach within ten feet (10') of power lines when fully grown as required by applicable state and federal regulations.

6. Trees shall not be planted within three feet (3') horizontal distance of electric or gas lines.

7. The city may remove any tree that is interfering with power lines.

8. Trees on the approved landscape and irrigation plan shall not be removed without permission from the city.

F. Maintenance:

1. Landscaping of detention/retention basins shall be maintained by the property owner. If the detention/retention basin is in a common area, then an owners’ association (OA) shall own and maintain the detention/retention basin. If an owners’ association is dissolved, maintenance becomes the joint and several responsibility of the individual property owners.

2. An owners’ association shall own and maintain all common areas including park strips between the street and any privacy walls. If an owners’ association is dissolved, maintenance becomes the joint and several responsibility of the individual property owners.

3. It shall be unlawful for any person owning real property within the city to:

a. Fail to provide landscaping and irrigation in all areas where it is required to exist. This shall apply to all real property throughout the city regardless of the age of the development, zone or status.

b. Fail to install, maintain, replace or repair landscaping and irrigation systems in all areas where it is required to exist or does exist.

c. Modify an approved landscape and irrigation plan or approved site plan without permission from the city. “Modifying the plan” means changing the type of large plant greater than six feet (6') tall at maturity; or decreasing the plant quantities or the size of the landscape area. Minor adjustments required to suit field conditions are permitted. Replacing a plant with the same type of plant is considered maintenance, not modification. (Ord. 2019-10-002, 10-10-2019; amd. Ord. 2020-06-002, 6-4-2020; Ord. 2021-02-007, 2-11-2021)