In South Louisiana, mow St. Augustine at 3.5 to 4.5 inches, Bermuda at 1 to 2 inches, Zoysia at 1 to 2.5 inches, and Centipede at 1.5 to 2.5 inches. In summer, mow often enough to follow the one-third rule, which usually means weekly for St. Augustine and every 5 to 7 days for Bermuda or Zoysia.
Mowing is the most important lawn care task you'll do all year. In South Louisiana's humid climate, cutting your grass at the right height and frequency determines whether your lawn fights off weeds and disease — or struggles through summer. Let's get it right.
Mowing Heights by Grass Type
Each warm-season grass needs a different cut height to stay healthy. Scalping a St. Augustine lawn (cutting it too short) can kill it. Cutting Bermuda too tall lets weeds take over.
| Grass Type | Ideal Height | Summer Height | Last Cut (Fall) | Notes |
|---|---|---|---|---|
| St. Augustine | 3.5–4.5 in | 4–5 in | 4 in | Most shade-tolerant; NEVER scalp below 3 in |
| Bermuda | 1–2 in | 2–2.5 in | 1.5 in | Needs full sun; can be scalped in spring to remove thatch |
| Zoysia | 1–2.5 in | 2–3 in | 2 in | Slow-growing; needs less frequent mowing |
| Centipede | 1.5–2.5 in | 2–3 in | 2 in | Low-maintenance but sensitive to scalping and high nitrogen |
Heights are for warm-season lawns in South Louisiana. Raise by 0.5–1 in during summer heat stress.
The 1/3 Rule: Never Cut More Than One-Third
The cardinal rule of mowing: never remove more than 1/3 of the grass blade at once. If your St. Augustine has grown to 6 inches, don't scalp it down to 3 inches in one pass. Mow to 4 inches, wait a few days, then drop to 3.5 inches.
Removing more than 1/3 shocks the plant. The grass redirects energy from root growth to leaf recovery — leaving roots shallow and the lawn vulnerable to drought, weeds, and disease. In Louisiana's hot summers, a scalped lawn can take weeks to recover.
What to do if you missed a week: Raise your mower deck to the highest setting. Mow. Wait 3-4 days. Mow again at your normal height. Never try to fix neglect in one pass.
Mowing Frequency: How Often to Mow in Louisiana
Frequency depends on the season, grass type, and rainfall. Use this guide for the River Parishes:
- Peak growing season (April–October): Weekly for St. Augustine; every 5-7 days for Bermuda and Zoysia. Grass grows fast in Louisiana heat and humidity.
- Slow season (November–March): Every 2-3 weeks for all types. Warm-season grasses go dormant or slow down significantly.
- After rain: A heavy Louisiana thunderstorm can add 1-2 inches of growth in days. Check the lawn 2-3 days after significant rain.
- When to stop for winter: Gradually raise the mowing height starting in October. The final fall cut should be about 0.5–1 inch higher than summer height.
Blade Sharpness: The Overlooked Essential
A dull mower blade tears grass instead of cutting it cleanly. The shredded tips turn brown within 24 hours, giving the lawn a ragged look. More importantly, torn grass blades lose more moisture and are more susceptible to fungal diseases — a major concern in Louisiana's humid climate.
- Sharpen blades at least twice per season. For a 1/2-acre lawn, that means 3-4 times per year.
- Signs of a dull blade: Ragged brown tips on grass blades, grass that looks "shredded" after mowing, uneven cut, the mower vibrating more than usual.
- Pro tip: Keep a spare sharpened blade on hand. Swap and sharpen on rotation so you're never mowing with a dull blade.
Mowing Patterns: Change Direction Every Time
Mowing the same direction every week creates ruts and compacts soil in wheel tracks. It also trains grass to lean in one direction, reducing the uniform look.
- Week 1: Mow north-south.
- Week 2: Mow east-west.
- Week 3: Mow diagonally (NW-SE).
- Week 4: Mow the opposite diagonal (NE-SW).
- Then repeat. This also helps the lawn stand upright for a cleaner cut.
Grasscycling: Leave the Clippings
Contrary to old advice, grass clippings should stay on the lawn — not go in bags. Clippings are 85% water and break down quickly, returning nitrogen to the soil. This practice provides up to 25% of your lawn's annual nitrogen needs.
- When to bag: If clippings are excessive (missed a week and they clump), or if treating a fungal disease and removing infected material.
- When NOT to bag: Regular weekly mowing. Leave clippings to decompose. It saves time, reduces landfill waste, and feeds your lawn.
- Mulching mowers cut clippings into finer pieces. If using a side-discharge mower, mow over heavy clippings a second time.
Edging: The Finishing Touch
A sharp edge between lawn and flower beds or walkways makes the entire property look professionally maintained. It also prevents grass from creeping into beds.
- Edge every 2-3 mowings during growing season.
- Use a half-moon edger or power edger for a clean vertical cut along sidewalks and driveways.
- String trimmers are for detail work — around trees, fence posts, and tight corners.
- Avoid "mower rash" — nicking flower bed edges. Edging creates a clean buffer zone.
Common Mowing Mistakes in South Louisiana
- Scalping St. Augustine: The #1 mowing killer in the River Parishes. Scalping exposes runners to sun and heat. St. Augustine is a bunch-type grass — it doesn't fill back in quickly.
- Mowing wet grass: After a Louisiana thunderstorm, wait a day to mow. Wet soil ruts and spreads fungal disease.
- Same pattern every week: Creates wheel ruts and compacted soil. Vary direction.
- Removing too much: Follow the 1/3 rule. Raise height and mow again in 3-4 days if needed.
- Mowing too short before summer: Weakens roots before the brutal June-August heat. Keep St. Augustine at 3.5-4 inches.
- Bagging unnecessarily: You're removing free fertilizer. Grasscycle unless there's a disease concern.
When to Call a Professional
If you're spending 2-3 hours every week on mowing and edging — or not getting the results you want — professional service might be right. Xcellent1 covers the entire River Parishes with consistent crews that follow best practices for every grass type.
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Get a Free Quote →Frequently Asked Questions
How short should I cut St. Augustine grass?
Keep St. Augustine between 3.5 and 4.5 inches in South Louisiana, and raise it to about 4 to 5 inches during summer stress. Never scalp below 3 inches, because St. Augustine recovers slowly and thin spots invite weeds and disease. If it got too tall, lower the deck in two cuts instead of one.
How often should I mow in summer?
During peak growth, mow St. Augustine about once a week, and mow Bermuda or Zoysia every 5 to 7 days if they are growing fast. After a heavy rain, check the lawn again in 2 to 3 days because warm-season grass can jump quickly. The rule is to mow often enough that you never remove more than one-third of the blade.
Should I bag grass clippings?
Usually no. Grass clippings are mostly water, break down fast, and can return a meaningful amount of nitrogen to the lawn, so grasscycling is better for most River Parishes yards. Bag only when clippings are clumping after a missed mow or when you are removing diseased material.
When is the best time to edge sidewalks and beds?
Edge every 2 to 3 mowings during the growing season, once the turf is dry enough to cut cleanly. That keeps a sharp line between lawn and beds and prevents grass from creeping into mulch or cracks. In Louisiana heat, a clean edge also helps the lawn look maintained without forcing extra trimming.
What should I do if I missed a week of mowing?
Raise the mower to the highest setting and take only part of the extra growth off on the first pass. Then wait 3 to 4 days and mow again at your normal height so you do not scalp the lawn. St. Augustine especially needs that staged approach after a skip.