Lawn Care & Commercial Mowing

Professional lawn care is the core service in the landscape maintenance industry. Proper mowing technique, correct cutting heights, equipment knowledge, and seasonal turf management separate a professional crew from someone who just pushes a mower. This guide covers everything you need to know for day-1 readiness on a commercial mowing crew.

Understanding Turf Grass

The foundation of professional lawn care is understanding what you are cutting. Different grass species have different requirements, and treating them all the same produces poor results.

Cool-Season Grasses (Northern States, Transition Zone)

These grasses grow most actively in spring and fall when temperatures are 60-75 degrees Fahrenheit. They slow down or go dormant in hot summers.

• Kentucky Bluegrass - The most common lawn grass in the northern United States. Fine-textured, dark green, spreads by rhizomes (underground runners). Optimal mowing height: 2.5-3.5 inches. Recovers well from damage because of its spreading growth habit. Requires more water than fescue.
• Tall Fescue - A bunch-type grass with a coarser texture. Deep-rooted and drought-tolerant once established. Optimal mowing height: 3-4 inches. Does not spread aggressively, so bare spots require reseeding. Increasingly popular because of its low water needs.
• Perennial Ryegrass - Fine-textured, fast-germinating. Often mixed with bluegrass for quick establishment. Optimal mowing height: 2.5-3.5 inches. Less heat and drought tolerant than fescue.
• Fine Fescue (creeping red, chewings, hard fescue) - Very fine-textured, shade-tolerant. Used in low-maintenance lawns and shaded areas. Optimal mowing height: 2.5-3.5 inches. Does not tolerate heavy traffic.

Warm-Season Grasses (Southern States)

These grasses grow most actively in summer when temperatures are 80-95 degrees Fahrenheit. They go dormant and turn brown in winter.

• Bermudagrass - Aggressive, fine-textured, heat-loving. Spreads rapidly by stolons and rhizomes. Optimal mowing height: 1-2 inches (common bermuda) or 0.5-1.5 inches (hybrid bermuda). Requires frequent mowing during peak season because of its fast growth. Does not tolerate shade.
• Zoysiagrass - Dense, slow-growing, fine-to-medium texture. Optimal mowing height: 1-2.5 inches. More shade-tolerant than bermuda. Takes longer to establish but forms a very dense, weed-resistant lawn.
• St. Augustinegrass - Coarse-textured, shade-tolerant, common in the Deep South and Gulf Coast. Optimal mowing height: 2.5-4 inches. Susceptible to chinch bugs and gray leaf spot.
• Centipedegrass - Slow-growing, low-maintenance, medium-textured. Optimal mowing height: 1.5-2.5 inches. Known as "lazy man's grass" because of its low fertilizer and mowing requirements.
• Bahiagrass - Coarse-textured, very drought-tolerant. Common in pastures and low-maintenance lawns. Optimal mowing height: 3-4 inches. Produces tall seed heads that require frequent mowing to control.

The One-Third Rule

This is the most important mowing principle: never remove more than one-third of the grass blade in a single mowing.

Why it matters:

• Cutting more than one-third at once removes too much of the plant's photosynthetic capacity (its food factory is in the leaves)
• The grass responds to severe cutting by diverting energy from root growth to blade growth, weakening the root system
• Stressed, weakened turf is more susceptible to weeds, disease, and insect damage
• Scalped turf exposes the soil surface, allowing weed seeds to germinate

Practical example: If your target mowing height is 3 inches, you should mow before the grass reaches 4.5 inches. If the grass gets ahead of you (after rain, vacation, equipment breakdown), raise the mower and make multiple passes over several days to bring it back down gradually.

Mowing Equipment

Commercial Zero-Turn Mowers

Zero-turn mowers are the standard for commercial lawn care because of their speed and maneuverability.

Common deck sizes:

• 36-inch - Walk-behind or stand-on. For residential properties, gated backyards, and tight areas.
• 48-inch - Stand-on or sit-down. Versatile size for medium properties and areas with moderate obstacles.
• 52-inch - The most popular commercial deck size. Good balance of productivity and maneuverability.
• 60-inch - For large open properties with few obstacles. Very productive on big turf areas.
• 72-inch - For parks, athletic fields, and very large commercial properties. Not practical for most residential or mixed-use work.

Controls:

• Dual lap bars control ground speed and steering. Pushing both bars forward moves the mower straight ahead. Pushing one bar forward while holding the other neutral turns the mower. Pushing the bars in opposite directions makes a zero-radius turn (the "zero-turn" the name refers to).
• Deck height is adjusted by a lever or knob on the machine, usually with notched positions in 1/4-inch increments.
• Blade engagement is a PTO switch or lever that engages the blade spindles.

Daily pre-operation check:

1. Engine oil level (check with the engine cold)
2. Fuel level
3. Tire pressure (check with a gauge - uneven tire pressure causes an uneven cut)
4. Blade condition (sharp, no cracks, bolts tight)
5. Deck level (should be level side-to-side and slightly pitched nose-down front-to-back, about 1/8 to 1/4 inch)
6. Belt condition (no cracks, proper tension, no fraying)
7. Air filter (clean, not plugged)
8. Safety switches functional (seat switch, blade engagement interlock)

Walk-Behind Mowers

Walk-behind mowers handle areas zero-turns cannot:

• Hydro walk-behinds (36-54 inch) - Commercial-grade mowers with pistol-grip or H-bar controls. Faster and more maneuverable than residential mowers. Used for gated areas, slopes too steep for zero-turns, and properties where a zero-turn is too large.
• Push mowers (21 inch) - For very tight areas, narrow side yards, ditch banks, and detail work. Every crew should carry one.
• Self-propelled mowers - Push mowers with a drive system. Easier on slopes and long runs.

Blade Types and Maintenance

Blade types:

• Standard lift (medium lift) - General-purpose blades. Work well in most conditions.
• High-lift - Designed to create strong airflow for bagging and clean discharge. Best for dry conditions. Can blow dust in dry, sandy soil.
• Mulching blades - Have extra cutting edges and a curved design that keeps clippings in the deck longer, cutting them into finer pieces. Best for mulching leaves and light clippings.
• Gator blades - A combination blade with a lifting design and serrated edges near the center. Good for mulching leaves.

Sharpening:

• Sharpen blades every 8-10 hours of use. On a full-day commercial schedule, that means sharpening or swapping blades every 1-2 days.
• A dull blade tears grass rather than cutting it cleanly. Torn tips turn brown and create a hazy, brownish appearance across the lawn. This is the most visible sign of dull blades and an immediate indicator of unprofessional work.
• Use a bench grinder or angle grinder to sharpen. Maintain the factory bevel angle (typically 30 degrees). Remove equal amounts from both ends to keep the blade balanced.
• Check blade balance on a blade balancer (a cone-shaped tool). An unbalanced blade vibrates, damages spindle bearings, and produces an uneven cut.
• Replace blades that are cracked, bent, or worn thin. A cracked blade can shatter at high RPM and become a lethal projectile.

Mowing Techniques

Mowing Patterns

Alternating your pattern each visit prevents ruts, soil compaction, and grain (where the grass learns to lean in one direction).

• Straight lines (north-south / east-west alternating) - The most common pattern. Efficient, professional-looking, and easy to maintain. Alternate direction each visit.
• Diagonal (45-degree angles) - Creates a professional diamond or striped appearance. Impressive on large, visible properties. Alternate the diagonal direction each visit.
• Perimeter first, then fill - Mow two passes around the perimeter of the property (or each section), then fill in the interior with straight lines. The perimeter passes give you room to turn without running off the turf.
• Spiral - Start at the outside and work inward, or vice versa. Useful for small or irregularly shaped areas. Less common commercially.

Striping

Stripes are created by the way the mower deck flattens and bends the grass in different directions. Grass blades bent away from you look lighter (reflecting sunlight), while blades bent toward you look darker (showing the shadow side).

• Full-width striping kits (roller or flap behind the deck) enhance the striping effect
• Mow in straight lines at a consistent speed for the cleanest stripes
• Overlap passes by 1-2 inches to avoid leaving uncut strips between rows
• Striping is most visible on tall fescue and Kentucky bluegrass. It is less visible on warm-season grasses that are cut short.

Mowing Slopes

Slopes are one of the most dangerous situations in commercial mowing:

• Riding mowers - Mow up and down slopes, never across. If the mower loses traction or slides, it will slide straight down rather than rolling sideways. Do not mow slopes steeper than 15 degrees with a riding mower.
• Walk-behind mowers - Mow across slopes (side to side). This keeps you above the mower at all times, never below it on the downhill side.
• Wet slopes - Do not mow. Wet grass on a slope is extremely slippery for both the operator and the mower wheels. Wait for the turf to dry.
• Steep slopes - Slopes too steep for any mower should be maintained with string trimmers, planted with ground cover, or treated with herbicide to keep vegetation under control.

Trimming and Edging

Trimming and edging are what give a property its finished, professional appearance. These tasks take 30-50 percent of the total mowing time on a typical commercial property.

String Trimmer Technique:

• Hold the trimmer with the head parallel to the ground for level cutting. Tilt the head at a slight angle to throw debris away from landscape beds, buildings, and vehicles.
• Trim at the same height as the mower. A trimmer that scalps around trees and obstacles creates brown rings that look unprofessional.
• Move at a consistent pace. Too fast = missed spots. Too slow = scalping.
• Use tap-and-go or auto-feed line advance systems. Pre-wound spool heads save time over manually winding trimmer line.
• Commercial trimmer line: .095 or .105 inch diameter is standard for most work. Heavier line (.130 inch) is used for thick weeds and brush.

Edging:

• Edge along all sidewalks, driveways, curbs, and patio edges. A clean edge is the single most impactful detail in lawn care.
• Use a stick edger (blade edger) for the cleanest results. A string trimmer turned on its side works but produces a less precise edge.
• Edge to a depth of about 1 inch. Deeper creates a trench that collects debris.
• Edge at every visit during the growing season. Skipping edging is immediately noticeable.

Turf Health Management

Professional lawn care goes beyond mowing. Maintaining turf health prevents problems and reduces long-term costs.

Fertilization

Soil Testing:

• Start with a soil test. It tells you exactly what nutrients the soil needs and what it does not. Applying fertilizer without a soil test is guesswork.
• Test soil every 2-3 years. Take samples from 6-8 locations, mix them, and submit to your local agricultural extension service.

Fertilizer Basics:

• Fertilizer labels show three numbers (e.g., 24-0-10) representing nitrogen (N), phosphorus (P), and potassium (K) as percentages by weight.
• Nitrogen promotes green, leafy growth. Phosphorus promotes root development. Potassium improves stress tolerance and disease resistance.
• Apply 3-4 pounds of total nitrogen per 1,000 square feet per year for cool-season lawns, split across 3-4 applications. Apply 4-6 pounds for warm-season lawns.
• Use slow-release (controlled-release) nitrogen sources when possible. They feed the turf over 6-8 weeks and are less likely to cause fertilizer burn.
• Calibrate your spreader before every application. Walk at a consistent speed and overlap pattern edges to avoid striping (light and dark bands from uneven application).

Weed Control

Pre-Emergent Herbicides:

• Applied before weed seeds germinate (crabgrass, goosegrass, spurge). Timing is critical - typically when soil temperatures at 2-inch depth reach 55 degrees Fahrenheit for 3-5 consecutive days.
• First application: early spring (March-April in most northern areas). Second application: late spring (6-8 weeks later).
• Do not apply pre-emergent if you plan to overseed within 6-8 weeks. Pre-emergents prevent grass seed germination too.

Post-Emergent Herbicides:

• Applied to actively growing weeds. Selective herbicides kill weeds without harming the turf. Non-selective herbicides (glyphosate) kill everything.
• Apply on calm days (wind under 5 mph) to prevent drift onto desirable plants.
• Spot-treat individual weeds rather than broadcast-spraying entire lawns when possible. This reduces chemical use and cost.
• Follow the label rate exactly. Over-application can damage turf; under-application wastes product and does not kill the target weed.

Aeration and Overseeding

• Aerate once or twice per year (spring and/or fall for cool-season grasses, late spring for warm-season grasses)
• Use a core aerator that removes plugs, not a spike aerator. Spike aerators compact soil around the holes rather than relieving compaction.
• Optimal conditions: soil moist but not saturated. Irrigate the day before if needed.
• Overseed immediately after aeration while the holes are open and seed can make soil contact.

Disease and Pest Identification

Know the signs of common turf problems so you can report them to the property manager or turf specialist:

• Brown patch - Circular patches of brown turf, 1-3 feet in diameter, with a darker brown "smoke ring" border. Caused by a fungus, most common in warm, humid conditions.
• Dollar spot - Small (silver-dollar-sized) bleached spots in the turf. Individual blades show hourglass-shaped lesions. Common when nitrogen is low.
• Grub damage - Irregular brown patches that peel up like carpet when pulled. Grubs (beetle larvae) feed on grass roots below the surface. Check by cutting a 1-square-foot section of turf and pulling it back - more than 8-10 grubs per square foot indicates treatment is needed.
• Chinch bugs - Yellowing and browning in sunny areas, especially in St. Augustine grass. Look for small black-and-white insects at the edge of damaged areas by pressing a bottomless can into the turf, filling it with water, and watching for bugs that float up.

Production and Efficiency

Commercial lawn care is a business, and efficiency directly affects profitability.

Route Optimization

• Group properties geographically to minimize drive time
• Schedule similar-sized properties together for consistent crew pacing
• Account for traffic patterns - schedule properties in congested areas during off-peak hours
• Allow travel time between properties (typically 10-15 minutes)

Crew Coordination

• On a typical two- or three-person crew, tasks are divided:
  • Mower operator: Handles the primary mower (zero-turn or walk-behind)
  • Trimmer/edger/blower: Handles all trimming, edging, and blowing operations
  • Third person (if applicable): Operates a second mower, handles detail work, or manages landscape bed maintenance
• The trimmer person should start trimming when the mower operator begins mowing (or ideally, slightly before). Both should finish at approximately the same time. The blower clears everything as the final step.
• Communication matters. Signal to each other before blowing debris, moving equipment through gates, or changing locations.

Quality Checkpoints

Before leaving any property:

1. Walk the property and look at it from the customer's perspective
2. Check for missed spots, uneven mowing lines, and scalped areas
3. Verify all clippings are blown off hard surfaces
4. Check that all gates are closed and locked as found
5. Verify no equipment, tools, or trash were left behind
6. Note any property issues (broken sprinkler, dead plant, damage) to report to the property manager

Safety

• Wear hearing protection, safety glasses, and closed-toe boots (steel toe recommended) at all times during mowing operations
• Walk the property before mowing to remove rocks, sticks, bottles, and other debris
• Keep bystanders at least 50 feet from operating mowers
• Never mow on steep slopes with a riding mower if there is a risk of rollover
• Do not refuel a hot engine. Allow it to cool first.
• Carry a first aid kit and a charged cell phone on every crew
• Know the location of the nearest emergency room for every route

Key Takeaways

• Follow the one-third rule and mow at the correct height for the grass species on each property
• Alternate mowing patterns to prevent ruts and soil compaction
• Keep blades sharp - sharpen or swap every 8-10 hours of use for a clean cut and healthier turf
• Trimming and edging take as much time as mowing but are what make a property look professional
• Adjust mowing practices by season: higher cuts in summer heat, gradual reduction in fall, and no mowing when grass is dormant