Your mower deck setting might be the single most important decision you make for your lawn. Cut too low and you’re scalping the turf, inviting weeds, and stressing the root system right when Florida’s heat demands the opposite. Cut too high and you’re encouraging thatch, a spongy canopy, and an unkempt look that’ll have your HOA sending letters.
The tricky part? The right height depends entirely on which grass you have — and often on which cultivar of that grass. A mowing height that keeps your neighbor’s Bermuda looking like a golf fairway would destroy your St. Augustine in a matter of weeks.
Here’s what the university research says, what we see in the field every day across Palm Beach County, and how to dial in the perfect mowing height for your specific lawn.
Table of Contents
St. Augustine Grass: 2.5–4″
- Floratam, BitterBlue, Classic — 3.5–4 inches
- Palmetto — 3–4 inches
- CitraBlue — 2.5–3.5 inches
- Seville, Sapphire, Captiva (dwarf types) — 2–2.5 inches
St. Augustine spreads only through above-ground stolons, so it needs a taller canopy than most warm-season grasses. Those stolons depend on shade and moisture from the leaf blades above them — cut too low and they dry out, thin patches develop, and weeds move in fast. The lower-profile cultivars like CitraBlue and the dwarf varieties can handle a shorter cut thanks to their denser, more horizontal growth habit, but even they shouldn’t be scalped.
St. Augustine Mowing Tips for Florida
In shade, go higher. If part of your yard gets less than 5–6 hours of direct sun, raise the mowing height on that section. The grass needs more leaf surface area to capture what light it can. This is especially important for Floratam, which is the least shade-tolerant of the common cultivars.
Don’t chase the “golf course look.” St. Augustine is not a sports turf — it’s a landscape turf. It’s supposed to look lush and full, not cropped tight. If you want that low, tight aesthetic, you’ll want Bermuda or a fine-textured Zoysia, not St. Aug.
Summer vs. winter. During the active growing season (roughly April through October here in South Florida), maintain your standard recommended height. When growth slows heading into the cooler months, you can lower slightly — but don’t drop below the minimum for your cultivar.
Bermuda Grass: 0.5–2″
Bermuda is the opposite end of the spectrum from St. Augustine. This grass wants to be mowed low. In fact, mowing Bermuda at typical St. Augustine heights (3.5–4 inches) is one of the most common mistakes we see — it causes the grass to grow leggy and stemmy rather than dense and lateral.
Bermuda spreads through both rhizomes (underground) and stolons (above ground), and close mowing encourages that lateral spread, which is what gives Bermuda its signature tight, carpet-like density.
Recommended Heights
Common Bermuda: 1–2 inches. For most home lawns maintained with a rotary mower, 1.5 to 2 inches is the practical range. UF/IFAS recommends 1 to 2 inches under low-to-moderate management. Common Bermuda should generally stay at the higher end of this range.
Hybrid Bermuda (Celebration, Bimini, TifTuf, Tifway 419, etc.): 0.5–1.5 inches. Hybrid varieties are bred for a finer texture and can handle — and actually prefer — a lower cut. Getting down below 1 inch typically requires a reel mower and a level lawn surface.
High-maintenance / reel-mowed Bermuda: 0.5 inches or lower. This is golf-green territory. You’ll need a quality reel mower, a very level surface, and you’ll probably be mowing every 2–3 days during summer. It looks incredible, but it’s a serious commitment in time, water, and fertilizer.
Bermuda Mowing Tips for Florida
Mow frequently. Bermuda grows fast during Florida’s warm months, especially when well-fertilized and irrigated. During peak season, weekly mowing is a minimum — many well-maintained Bermuda lawns need cutting every 4–5 days to stay within the one-third rule.
Never remove more than one-third of the blade. This applies to all grasses, but Bermuda is especially unforgiving of skipped cuts. If you let it get too tall and then scalp it back down, you’ll remove most of the green leaf tissue and expose a forest of brown stems. This shocks the grass and can take weeks to recover, particularly in the heat.
Spring scalp for a clean start. Many Bermuda lawn owners drop their mower to its lowest setting for the first cut of spring to remove dormant tissue and encourage fresh growth. This is one of the few times aggressive low-cutting is beneficial. After the scalp, gradually raise back to your regular mowing height.
If you’re mowing above 2 inches, rethink the plan. Some lawn services default to mowing everything at one height — usually around 3 to 3.5 inches — because it works for St. Augustine. If you have Bermuda and your service is cutting it at St. Aug heights, your turf is suffering for it. It’ll look puffy, feel spongy, and won’t develop the tight density that makes Bermuda special.
Zoysia Grass: 1.75–2.5″
Zoysia sits between St. Augustine and Bermuda in almost every way — growth habit, texture, mowing height, and maintenance requirements. It’s gaining popularity in Florida, especially the Empire variety, for its drought tolerance, traffic resistance, and handsome appearance.
Like Bermuda, Zoysia spreads through both rhizomes and stolons. But it grows more slowly, which means less mowing frequency but also a longer recovery time if you make mistakes.
Recommended Heights by Texture
Medium- to coarse-textured Zoysia (Empire, Zenith, JaMur): 1.75–2.5 inches. UF/IFAS recommends this range for the standard Zoysia varieties you’ll find in most Florida home lawns. Empire, by far the most commonly planted Zoysia in Florida, does best at 2 to 2.5 inches.
Fine-textured Zoysia (Emerald, Zeon, Diamond): 0.25–1 inch. These are the premium, fine-bladed varieties you’ll see on high-end landscapes and golf courses. They require frequent mowing (often every 3–5 days) and a reel mower to maintain at their ideal low heights.
Zoysia Mowing Tips for Florida
Use a sharp blade — this matters more with Zoysia. Zoysia leaves contain more lignin and silica than other turfgrasses, making them tougher and harder to cut cleanly. A dull mower blade will shred and tear Zoysia, leaving ragged brown tips that ruin the appearance and open the door to disease. Sharpen your blade more often than you think you need to — monthly during peak growing season isn’t excessive.
Watch for thatch buildup. Zoysia is notorious for building up a thick thatch layer, especially when over-fertilized or mowed too high. Maintaining the correct mowing height is one of the best ways to keep thatch in check. If the lawn starts feeling spongy underfoot, it’s time to address thatch with vertical mowing or power raking.
Adjust for shade. If your Zoysia is in a partially shaded area, raise the height toward the top of the recommended range (2–2.5 inches for Empire-type varieties). The extra leaf area helps the grass photosynthesize with less light, keeping it healthier through Florida’s long, shady summers under oak canopies.
Don’t confuse Zoysia with St. Augustine mowing. We see this frequently in communities where some homes have Zoysia and others have St. Augustine. Lawn services sometimes cut everything the same. Zoysia maintained at 3.5–4 inches (St. Aug height) will pile up on itself, look shaggy, build excessive thatch, and generally underperform. Make sure your mowing crew knows what turf you have.
Quick Reference: Mowing Heights at a Glance
| Grass Type | Cultivar / Category | Mowing Height | Mower Type |
|---|---|---|---|
| St. Augustine | Floratam, BitterBlue, Classic | 3.5–4″ | Rotary |
| Palmetto | 3–4″ | Rotary | |
| CitraBlue | 2.5–3.5″ | Rotary | |
| Seville, Sapphire (dwarf) | 2–2.5″ | Rotary | |
| Bermuda | Common | 1–2″ | Rotary |
| Hybrid (Celebration, TifTuf) | 0.5–1.5″ | Reel preferred | |
| High-maintenance | 0.5″ or less | Reel required | |
| Zoysia | Empire, JaMur (medium/coarse) | 1.75–2.5″ | Rotary |
| Emerald, Zeon (fine) | 0.25–1″ | Reel preferred |
The Rules That Apply to Every Grass
No matter which warm-season turf you have, a few principles are universal:
The one-third rule is non-negotiable. Never remove more than one-third of the grass blade in a single mowing. If your St. Augustine is supposed to stay at 4 inches, mow it when it reaches about 5.5 to 6 inches — don’t wait until it’s 8 inches tall and hack it back. This single practice prevents more lawn problems than any product you can spray or spread.
Sharp blades, always. A dull mower blade tears rather than cuts, leaving ragged edges that brown out and create entry points for fungal disease. This is especially visible on St. Augustine’s wide leaf blades. Sharpen your mower blade at least every 20–25 hours of mowing, or monthly during peak season.
Leave the clippings. Unless clippings are so heavy they’re clumping on the surface, leave them on the lawn. They decompose quickly, return nitrogen and other nutrients to the soil, and do not contribute to thatch (that’s a persistent myth). This is essentially free fertilizer.
Adjust for the season. During Florida’s active growing season, stick to the standard recommended height. As growth slows in fall and winter, you can raise slightly to give the grass more leaf protection heading into dormancy or cool-weather stress. In spring, many homeowners drop the height for the first mow or two to clear dead tissue and encourage fresh green growth.
Mow when the grass is dry. Wet grass clumps, cuts unevenly, and can spread disease. Early-to-mid morning (after dew has dried) or late afternoon are the best windows. Avoid mowing in the midday heat if possible — it’s stressful for both you and the turf.
What Happens When You Get It Wrong
Mowing too low is the number-one cultural mistake Florida homeowners make. The consequences cascade:
The grass loses leaf area, which reduces its ability to photosynthesize. Less photosynthesis means weaker root development. Weaker roots mean less drought tolerance, which matters enormously in Florida’s sandy soils and summer heat. The thinned canopy exposes soil to sunlight, giving weed seeds the light they need to germinate. And a stressed lawn is more susceptible to chinch bugs, fungal disease, and nematode damage.
All of that from setting your mower deck one or two notches too low.
Mowing too high has its own problems — excessive thatch, a spongy feel, poor air circulation that promotes fungal disease, and a shaggy appearance — but the damage is generally slower and more correctable than chronic scalping.
The Bottom Line
Getting your mowing height right is one of the easiest, cheapest, and most impactful things you can do for your Florida lawn. It doesn’t cost anything to raise or lower your deck — but the results compound over weeks and months into a lawn that’s either thriving or struggling.
Know your grass. Know your cultivar. Set your mower accordingly. And when in doubt, err on the side of cutting a little higher — your turf will thank you for it.