• ♦Manual Notice 2018-1
• ►1. Vegetation Management Guidelines
  • ►1. Introduction
    • ♦Background
    • ♦Purposes of Guidelines
  • ►2. Determining Levels of Vegetation Management
    • ♦Purpose of Levels
    • ♦Who Determines the Levels?
  • ►3. Guidelines for Levels of Vegetation Management
    • ♦Overview
    • ♦Developed Urban Highways
    • ♦Mowing and Trimming
    • ♦Herbicide Application
    • ♦Wildflowers
    • ♦Ornamental Plantings
    • ♦Erosion Control
    • ♦Wildlife Habitat and Native Plant Conservation
    • ♦Endangered and Threatened Plants and Animals
    • ♦Invasive Species
    • ♦Acreage Mowed
    • ♦Mowing by TxDOT Employees
    • ♦Exceptions and Variances
    • ♦Rural Highways
    • ♦Mowing and Trimming
    • ♦Herbicide Application
    • ♦Wildflowers
    • ♦Ornamental Plantings
    • ♦Erosion Control
    • ♦Wildlife Habitat and Native Plant Conservation
    • ♦Endangered and Threatened Plants and Animals
    • ♦Invasive Species
    • ♦Acreage Mowed
    • ♦Mowing by TxDOT Employees
    • ♦Exceptions and Variances
  • ►4. Special Situations
    • ♦Overview
    • ♦Manicured Areas
    • ♦Grass Establishment
    • ♦Native Grasses
• ►2. Mowing Standards
  • ►1. Types of Mowing
    • ♦Overview
    • ♦Modified Full-Width Mowing
    • ♦Exceptions to the 30 Foot Modified Full-Width Mowing Policy
    • ♦Strip Mowing
    • ♦Spot Mowing for Safety
  • ►2. Transitions
    • ♦When Required
    • ♦Rate
  • ►3. Special Mowing Situations
    • ♦Rural Medians and Outer Separations
    • ♦Rural Intersections
    • ♦Urban Intersections
    • ♦Cut and Fill Sections
    • ♦Rest Areas and Picnic Areas
  • ►4. Mowing and Herbicide Application
    • ♦Need for Coordination
    • ♦How Overspray Herbicide Works
    • ♦Guidelines
    • ♦More Information
  • ►5. Mowing and Litter Pickup
    • ♦Guideline
    • ♦Explanation
  • ►6. Other Precautions
    • ♦Overview
    • ♦Delay Mowing When Soil Is Wet
    • ♦Avoid Mowing Steep Slopes
    • ♦Use Appropriate Cutting Height
    • ♦Coordinate Mowing with Grass Seed Production
  • ►7. Non-Mow or Natural Areas and Acreage Evaluations
    • ♦Introduction
    • ♦Establishing Non-Mow or Natural Areas
    • ♦Calculating Acreage to be Mowed
• ▼3. Native and Introduced Grasses, Wildflowers and Legumes
  • ►1. Overview
    • ♦Background
    • ♦Benefits
    • ♦General Nature of Information
  • ►2. Native and Introduced Grasses
    • ♦Introduction
    • ♦Establishment and Growth
    • ♦Maintenance
    • ♦Erosion Control and Soil Stabilization
    • ♦Wildlife Habitat
  • ►3. Obtaining Seeds
    • ♦Introduction
    • ♦Nursery Grown Seed
    • ♦Stockpiling Topsoil from Roadway Construction Sites
    • ♦The Outdated use of making “Flower Hay”
  • ►4. Wildflower Propagation
    • ♦Introduction
    • ♦ Sun or Shade
    • ♦Soil Condition
    • ♦Moisture
    • ♦Germination Time
  • ►5. General Wildflower Planting Guidelines
    • ♦When to Plant
    • ♦Selecting Seeds
    • ♦Determining Planting Rate
    • ♦Pure Live Seed (PLS)
    • ♦Preparing the Soil
    • ♦Sowing the Seed
    • ♦Watering
  • ►6. Bluebonnets and Other Legumes
    • ♦Introduction
    • ♦Blooming Date
    • ♦Obtaining Seed
    • ♦Where to Plant
    • ♦Planting Time
    • ♦How to Plant
    • ♦Special Precautions
    • ♦Need for Rhizobium
    • ♦Important Points
  • ►7. Selecting Wildflowers by Natural Vegetative Region
    • ♦Natural Vegetative Regions
  • ▼8. USDA Hardiness Zone Map
    • ♦USDA Hardiness Zone Map with Districts Outlined
• ►4. Pruning Guidelines
  • ►1. Reasons for Pruning
    • ♦Safety
    • ♦To Accommodate Utilities
    • ♦Health of the Vegetation
    • ♦Aesthetic Considerations
    • ♦Tree-Specific Reasons
  • ►2. Pruning Guidelines
    • ♦Introduction
    • ►Aesthetic Principles
  • ►3. Oak Wilt
    • ♦Background
    • ♦ Affected Area
    • ♦How it Spreads
    • ♦Symptoms
    • ♦What Can Be Done?
    • ♦More Information
  • ►4. Trees and Utility Lines
    • ♦Locating Utility Lines
    • ♦Texas Administrative Code
    • ♦When Trees Are Not Pruned on the Right of Way
    • ♦Examples of Severe, But Acceptable Tree Modifications by Utilities
    • ♦Examples of Unacceptable Tree Modifications
  • ►5. Texas Administrative Code for Utility Accommodation
    • ♦Texas Administrative Code §21.38
• ►5. Vegetation Management and Wildlife Habitat
  • ►1. Overview
    • ♦Background
    • ♦Threat of Habitat Degradation
    • ♦Extent of Habitat Degradation
    • ♦Significance of Roadsides
  • ►2. Preserving and Enhancing Habitat
    • ♦Strive for Diversity
    • ♦Mow Wisely
    • ♦Use Trees and Shrubs
    • ♦Nurture Seeds
    • ♦Encourage Wildflowers
    • ♦Roadsides and Endangered Species
  • ►3. Changing Attitudes
    • ♦Wildlife Density and Safety
    • ♦Public Perceptions of Unmowed Roadsides
    • ♦Sample News Release

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Section 8: USDA Hardiness Zone Map

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USDA Hardiness Zone Map with Districts Outlined

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Figure 3-4. USDA Hardiness Zone Map with Districts.