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Chapter 2ݤ9229 TREE PRESERVATION AND PLANTING REQUIREMENTS

§9229.4 PLANTING REQUIREMENTS

Ukiah Zoning Code · 2026-07 edition · updated 2026-07-07 · Ukiah

A. Required Tree Planting: Tables 21, 23, 24, and 26 identify the required tree species for planting as street trees, parking lot trees, and riparian trees, respectively. These tables also include information regarding the characteristics of each tree in the table (such as evergreen or deciduous, size, drought tolerance, native, and the suitability/compatibility with various locational constraints). Tree species should be selected based on the conditions specific to the proposed development. The tree species included in Tables 21 and 23 were selected based on hardiness, drought tolerance, native/local preference, as well as unifying design principles.

B. Minimum Tree Size: The minimum tree size for street trees, parking lot trees, riparian trees, and replacement trees required as condition of project approval or as mitigation measures for a project shall be No. 15 unless a different size is approved by the decision making body or required in order to mitigate an environmental impact of the project.

C. Irrigation Plan: Irrigation shall be provided to new trees. The type of irrigation provided (e.g., drip, bubbler, spray) shall be determined by the water requirements of the specific species. Every effort shall be made to place plants with similar water needs together. A conceptual irrigation plan shall be included as part of the landscaping plan submitted as part of the development permit application.

D. Additional Requirements: Additional considerations for tree planting and landscaping are included in section 9225 of this code, Table 10: Landscaping Standards for All Developments, and section 9228 of this code, Table 18: Open Parking Lot Design Standards.

E. Street Trees Required: Residential, commercial, and industrial developments and the development of individual lots shall include the planting of street trees at developer’s/property owner’s expense, including the following:

  1. Operable irrigation system;

  2. Tree wells a minimum of four feet (4') by four feet (4');

  3. Root barriers when required by the Department of Public Works;

  4. Trees grates when required by the Department of Public Works;

  5. Structural soil when required by the Department of Public Works or Planning Department; and

  6. One street tree for every thirty feet (30') of parcel frontage with the exact location to be determined by the Public Works Department and Planning Department based on the location of sewer and water lines, underground and overhead lines and the purpose requirements of this code. (Ord. 1139, §2 (Exh. A, 10.040), adopted 2012)

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▸ Contents — Ukiah Zoning Code
Ukiah Zoning Code
  1. Chapter 2
  2. ▸ Chapter 2
    Overview
    1. §9055 PURPOSE AND INTENT
    2. §9056 PURPOSE AND INTENT
    3. §9057 PURPOSE AND INTENT
    4. §9058 PURPOSE
    5. §9067.5 LOT COVERAGE
    6. §9135 PURPOSE AND INTENT
    7. §9170 PURPOSE AND INTENT
    8. §9174 PURPOSE
    9. §9220 PURPOSE
    10. §9221 APPLICABILITY
    11. §9222 ZONING
    12. §9223 BUILDING AND SITE USES
    13. §9224 STANDARDS FOR SPECIFIC LAND USES
    14. §9225 SITE AND BUILDING DEVELOPMENT STANDARDS
    15. §9227 HISTORICAL BUILDING STANDARDS
    16. §9228.1 PARKING REQUIRED
    17. §9228.2 NUMBER OF PARKING SPACES REQUIRED
    18. §9228.3 REDUCTION OF REQUIRED VEHICLE PARKING
    19. §9228.4 EXCESS PARKING
    20. §9228.5 LOCATION OF REQUIRED VEHICLE PARKING
    21. §9228.6 PARKING STALLS AND DRIVE AISLES
    22. ▸ §9229 TREE PRESERVATION AND PLANTING REQUIREMENTS
      Overview
      1. §9229.1 PURPOSE
      2. §9229.2 APPLICABILITY
      3. §9229.3 TREE PRESERVATION
      4. §9229.4 PLANTING REQUIREMENTS
      5. §9229.5 STREET TREE DESIGN PRINCIPLES
      6. §9229.6 USE OF ALTERNATE TREE SPECIES
      7. §9229.7 REQUIRED STREET TREES
      8. §9229.8 ALTERNATE STREET TREES FOR PRIMARY STREETS
      9. §9229.9 REQUIRED STREET TREES FOR NONPRIMARY STREETS
      10. §9229.10 REQUIRED PARKING LOT TREES
      11. §9229.11 ALTERNATE PARKING LOT TREES
      12. §9229.12 REQUIRED RIPARIAN TREES
    23. §9230 CIRCULATION STANDARDS
    24. §9231 ADMINISTRATION AND PROCEDURES
    25. §9232 GLOSSARY

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