Side-by-Side Comparison
Lawn & Garden
Grass Mowing Heights vs. Plant Hardiness Zones
Comparing 2 standards across 18 specifications. 18 key differences identified.
Comparing:
Grass Mowing Heights
Plant Hardiness Zones
Turfgrass cutting heights vary between cool-season grasses (Kentucky Bluegrass 2.5–3.5", Tall Fescue 3–4") and warm-season grasses (Bermudagrass 1–2", Zoysia 1–2"), governed by the One-Third Rule never removing more than 1/3 of the blade in a single mowing.
The USDA Plant Hardiness Zone Map divides North America into 13 geographic zones based on the average annual extreme minimum winter temperature in 10°F (-5.6°C) increments, subdivided into 5°F 'a' and 'b' half-zones to determine plant winter survival.
Specification Comparison Table
18 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
GCSAA Guidelines / University Turf Extension Research | USDA Plant Hardiness Zone Standard (1990–2023 30-Year Normals) |
|
The One-Third Rule
|
Never remove more than 1/3 of total grass blade height in one mowing | — |
|
Kentucky Bluegrass
|
2.5 to 3.5 inches (6.4–8.9 cm) | Cool-season standard | — |
|
Tall Fescue
|
3.0 to 4.0 inches (7.6–10.2 cm) | Drought-tolerant cool-season | — |
|
Perennial Ryegrass
|
2.0 to 3.0 inches (5.1–7.6 cm) | Cool-season overseed | — |
|
Fine Fescue
|
2.0 to 3.0 inches (5.1–7.6 cm) | Shade-tolerant cool-season | — |
|
Bermudagrass
|
1.0 to 2.0 inches (2.5–5.1 cm) | Warm-season sun lover (Reel or rotary) | — |
|
Zoysiagrass
|
1.0 to 2.0 inches (2.5–5.1 cm) | Dense warm-season carpet | — |
|
St. Augustinegrass
|
3.0 to 4.0 inches (7.6–10.2 cm) | Coarse warm-season lawn | — |
|
Zone Temperature Increment
|
— | 10°F (5.6°C) per main zone number | 5°F (2.8°C) per 'a' and 'b' half-zone |
|
Zone 3 (Extreme North)
|
— | -40°F to -30°F (-40.0°C to -34.4°C) | Birch, Spruce, Haskap berry |
|
Zone 4 (Northern Cold)
|
— | -30°F to -20°F (-34.4°C to -28.9°C) | Sugar Maple, Honeycrisp Apple |
|
Zone 5 (Upper Midwest / NE)
|
— | -20°F to -10°F (-28.9°C to -23.3°C) | Oak, Dogwood, Lavender |
|
Zone 6 (Mid-Atlantic / Midwest)
|
— | -10°F to 0°F (-23.3°C to -17.8°C) | Boxwood, Peach, Hydrangea |
|
Zone 7 (Transitional / South)
|
— | 0°F to 10°F (-17.8°C to -12.2°C) | Crape Myrtle, Fig, Magnolia |
|
Zone 8 (Deep South / PNW)
|
— | 10°F to 20°F (-12.2°C to -6.7°C) | Rosemary, Camellia, Oleander |
|
Zone 9 (Subtropical South)
|
— | 20°F to 30°F (-6.7°C to -1.1°C) | Citrus, Avocado, Hibiscus |
|
Zone 10 (Tropical / Frost-Free)
|
— | 30°F to 40°F (-1.1°C to +4.4°C) | Bougainvillea, Mango, Banana |