Lawn Care Guide for Plaquemines Parish
Plaquemines Parish, Louisiana
USDA SSURGO / PHZMData Story
About Lawn Care in Plaquemines Parish, Louisiana
A Coastal Edge in Plaquemines
Plaquemines Parish enjoys a lawn difficulty score of 44.4, making it one of the easiest parishes in Louisiana for turf care. While better than the state average, it still sits slightly below the national score of 50.0.
Moderate Heat but High Humidity
While it receives 61.1 inches of rain, the parish only deals with 47 extreme heat days, far fewer than the state average of 84. This coastal influence helps protect grass from the thermal stress seen further inland.
Ideal pH with Heavy Clay
The soil pH of 6.46 is excellent and sits perfectly within the ideal range for lawn health. However, the 37.3% clay content means the soil is heavy and slow-draining, which can be an issue given the high annual rainfall.
Severe Drought Warning
Despite the coastal location, 99.3% of the parish is currently in severe drought. After 17 weeks of drought in the past year, consistent irrigation is the only way to keep lawns from going dormant.
Early Starts in Zone 9b
St. Augustine grass is the standard for this region and thrives in the local conditions. With the last frost typically arriving on February 3, Plaquemines offers one of the longest growing seasons in the nation.
Lawn Difficulty Score
Top Grass Fit for Plaquemines Parish
Excellent match
Pennington Zenith Zoysia Grass Seed & Mulch
Pennington
Top cultivar score: 100/100
Zone 9b vs Zoysiagrass's 6–9 band.
Soil pH 6.46174693586357 vs Zoysiagrass's 6–6.5 window.
Precipitation 61.1125" + soil AWC vs Zoysiagrass's 20–30" need.
Growing-degree-days + frost window vs a advanced-difficulty establishment.
Zenith Zoysia occupies a unique position in the grass seed market: it's essentially the only Zoysia variety widely available as seed. Most Zoysia (Emerald, Zeon, Innovation) is sold as sod or plugs at $300-500+ per 1,000 sq ft.
Limited product coverage — one vetted cultivar for this species.
Shop Pennington Zenith Zoysia Grass Seed & MulchIn Plaquemines Parish, USDA zone 9b, soil pH 6.5, Pennington Zenith Zoysia Grass Seed & Mulch scores 100/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Why we ruled these out
- Outsidepride Midnight Kentucky Bluegrass Seed — USDA zone 9b is above Outsidepride Midnight Kentucky Bluegrass Seed's effective range (2–8); not recommended for this county.
See our fit-score methodology for how survivability is determined.
Recommended Grasses
Bermudagrass
Cynodon dactylon
Best Grass Seed for Plaquemines Parish
Zone 9b • Warm-season grasses thrive here.
Find Seeds for Zone 9bClimate Snapshot
Annual Precip
61.1"
Growing Degree Days
7,328.475
Base 50F
Last Spring Frost
02/03
First Fall Frost
12/06
Days Above 95F
47
Hardiness Zone
9b
Seeding Calendar — Zone 9B
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Begin mowing when grass reaches 3 inches
- Start irrigation if rainfall is below 1 inch/week
- Soil test every 2-3 years — adjust lime or sulfur as needed
Summer
- Raise mowing height to reduce heat stress
- Water deeply 1-2 times per week (1 inch total)
- Avoid fertilizing cool-season grasses in peak heat
- Scout for grubs and treat if >10 per sq ft
Fall
- Overseed warm-season lawns if thinning
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Apply pre-emergent for winter weeds
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Overseed with ryegrass for winter color
Watering Deficit Calculator
Monthly Deficit
0.0"
inches of water
Monthly Water
0
gallons
Estimated Monthly Cost
$0.00
at $0.008/gallon average
Estimates based on 61" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Plaquemines Parish
Excess Moisture & Fungal Disease
High annual rainfall (61 inches) increases risk of fungal diseases like brown patch and dollar spot. Ensure good drainage and avoid overwatering.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Plaquemines Parish
Lawn Verdict
Plaquemines Parish is in USDA hardiness zone 9b, a warm zone well-suited to heat-tolerant grasses. with winter lows reaching around 25.0°F. and 7,328.475 growing degree days annually, supporting vigorous warm-season lawns. High annual precipitation (61.1 inches) supports lush growth but increases disease pressure.
Seasonal Breakdown
Wait until after February 3 to seed or overseed; soil temperatures should consistently reach 50-55°F. Summers are warm (July averages 82.5°F); monitor for heat stress and water when soil is dry 2-3 inches down. With 46.625 days above 90°F annually, warm-season grasses recover faster from summer stress than cool-season types. Aerate and overseed cool-season lawns by early fall, well before December 6; this is the best renovation window. Mild winters (January averages 54.1°F) allow year-round mowing for warm-season lawns and minimal dormancy.
Watering Guidance
Plaquemines Parish receives abundant rainfall (61.1 inches annually), so lawns rarely need supplemental irrigation. Currently, 100.0% of the county is in severe drought according to the US Drought Monitor. Mandatory watering restrictions may be in effect; follow local guidelines and prioritize tree and shrub watering over turf. Standard warm-season watering of 1 inch per week is usually adequate during summer. High heat accumulation means warm-season grasses use water aggressively — monitor soil moisture regularly.
Regional Context
Plaquemines Parish is close to the Louisiana average temperature, the growing season is noticeably longer than the state average, USDA zone 9b helps guide grass selection compared to neighboring counties.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Plaquemines Parish in?
What is the best grass for Plaquemines Parish?
How much rainfall does Plaquemines Parish get?
What is the soil pH in Plaquemines Parish?
Data sourced from USDA SSURGO, NOAA Climate Normals (1991-2020), USDA Plant Hardiness Zone Map, and US Drought Monitor. Lawn difficulty scores and grass recommendations are estimates for informational purposes only.
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