Grass Types for North Alabama Lawns
From the lawn and property care guide.
Lawn and property care guide · North Alabama
Mowing heights and the one-third rule
What height each grass grown in North Alabama should be cut, why the one-third rule sets the mowing interval, and what scalping actually costs a lawn.
The rule
Never take off more than a third of the leaf
The one-third rule is the single most useful thing to know about mowing. Take more than about a third of the blade in one cut and the plant spends stored energy replacing leaf instead of building roots.
It is worth being clear about what the rule actually governs, because it is not really about height. It sets the interval. If a lawn is kept at two inches, the rule says cut it when it reaches three, and how many days that takes is a matter for the weather rather than the diary.
That is why a mowing schedule that holds firm through the year is fighting the lawn. Warm rain and long days can double the growth rate inside a fortnight, and a dry August can halve it again. A lawn that genuinely needs a weekly cut in May is often comfortable at every other week by September, and a shaded lawn may never need weekly visits at all.
When a lawn has got away from you - a holiday, three weeks of rain, a mower in the shop - the answer is to bring it down over two or three cuts a few days apart rather than one. Taking it back to height in a single pass in June is the version of this that does visible damage.
By species
What height each grass wants
There is no one height that is right for every lawn in Marshall County. It depends on the grass, on how much sun the area gets, on whether the lawn is irrigated, and on the time of year.
Two adjustments are worth making every year. Raise the deck a notch through the hottest, driest weeks: taller leaf shades its own soil, holds moisture longer and supports deeper roots, and each cut takes less off a plant that is already under stress. And where an area is in more shade than the rest of the lawn, cut it higher than the sunny part rather than running one height across everything.
| Grass | Usual home-lawn height | Notes |
|---|---|---|
| Common Bermuda | About 1 to 2 inches | Takes low cutting better than anything else here, if mown often enough |
| Hybrid Bermuda | Lower again | Needs frequent mowing to hold it; not a fortnightly lawn |
| Zoysia | About 1 to 2 inches | Fine-bladed types take the lower end; builds thatch if left and then scalped |
| Centipede | About 1.5 to 2 inches | Slow and low growing. Cutting short is a common way to thin it out |
| St. Augustine | About 2.5 to 4 inches | Toward the top end in shade. Short cutting weakens it quickly |
| Tall fescue | About 2.5 to 4 inches | Toward the top end through summer. Height is its main heat defence |
These are the ranges these species are normally held at in this climate, not a prescription for a particular lawn. Deck heights get set to what is actually growing on the property and adjusted through the season.
Scalping
What cutting short actually costs
Scalping is the version of breaking the one-third rule that does visible damage. Take a lawn down too far in one pass and the soil underneath is suddenly in full sun.
Exposed soil dries quicker and heats up, and it is exactly the seed bed a weed is waiting for. That is the real cost, and it is not paid in the week the lawn was scalped - it is paid over the following two months, while the turf is outcompeted by everything that germinated in the gap.
It is also why a scalped lawn so often ends up being treated for weeds. The weeds are the symptom; the mower was the cause. Somewhere between mowing height, watering and feeding is nearly always the reason a lawn is thin enough for weeds to matter.
There is one deliberate exception. An early-spring scalp on dormant Bermuda or zoysia, to clear the dead top growth before green-up, is a timing decision made on purpose. It is not a habit and it is not something to do to a lawn in June.
The mower itself
A sharp blade, and dry grass
A sharp blade slices; a dull one tears. The torn end dries out and browns, which is why a lawn can look hazy and brown a day or two after being cut even at the right height.
The frayed wound also stays open longer than a clean cut does, which gives disease an easier way in. Sand and grit dull an edge far faster than grass does, so a lawn with thin patches or bare soil goes through blades more quickly than a thick one.
Wet grass is the other half of it. It cuts raggedly, clumps behind the deck and smothers what is underneath, and a mower driven across saturated ground leaves ruts and compaction that outlast the mess. That is why a scheduled visit sometimes moves after heavy rain: moving a day costs nothing, and a rutted lawn takes a season to recover.
Clippings, for what it is worth, are not the problem people think they are. Clippings from a normal cut break down quickly and return nutrients to the soil, and they are not what causes thatch. Bagging makes sense when the lawn has got long, when it is wet, or when disease is running through it.
- Sharpen often enough that the cut stays clean - several times a season for most mowers
- Vary the mowing direction between visits so the grass does not learn to lean
- Let the surface dry before mowing where you can
- Leave clippings on unless they would sit in clumps
- Blow the drives, walks and patios off afterwards, before the clippings stain or wash into a storm drain
On a schedule
What a maintenance visit covers
A visit is not finished when the mowing stops. Trimming, edging and blowing the hard surfaces are what turn a cut lawn into a property that looks looked after.
A mower deck cannot get everywhere, and the places it cannot reach are exactly the places a property starts to look neglected first: fence lines, mailbox and light posts, air conditioning units, tree rings, the strip against the foundation. Edging is the separate job of cutting a clean line where turf meets concrete, so a drive keeps its shape rather than slowly disappearing under a lip of grass.
Weekly, every other week and monthly are all available and there is no annual contract to sign. Lawn and yard maintenance starts at $55, and what a property actually costs depends on its size, its slope and how much trimming it has. Full detail is on the lawn care maintenance page.
Answers
Questions about mowing heights guide
What is the one-third rule?
Never take off more than about a third of the leaf blade in one cut. In practice it sets the mowing interval rather than the height.
How short should zoysia be cut?
Zoysia in a home lawn is usually held around one to two inches, with the finer-bladed types taking the lower end better than the coarse ones. Regular cutting at a steady height matters more than the exact number.
What height should Bermuda be cut?
Common Bermuda is normally kept around one to two inches in a home lawn, and hybrid Bermuda lower again, provided the mowing is frequent enough to stay inside the one-third rule.
Should I cut higher in summer?
Yes. Raising the deck a notch through heat and drought is one of the cheapest things you can do for a lawn. Taller leaf shades its own soil and slows how fast it dries.
Why does my lawn look brown right after mowing?
Either too much leaf came off at once, so you are seeing the pale lower stems, or the blade is dull and has torn rather than cut. Both settle within a week or two once corrected.
Should clippings be bagged?
Usually not. Clippings from a normal cut break down quickly and are not what causes thatch. Bag when the lawn has got long, when it is wet, or when disease is running through it.
Read next
Related reading
North Alabama Lawn Watering Guide
From the lawn and property care guide.
Drought, Heat Stress and Lawn Dormancy
From the lawn and property care guide.
Lawn Care Maintenance
A service HRH Lawn Care handles.
HRH Lawn Care Services
Not sure what your property needs?
Call and ask. We would rather come and look at it than guess over the phone, and it does not cost you anything either way.