Strimmer Guides

How to Use a Grass Strimmer Correctly

For successful and efficient grass trimming, it's essential to master the right technique. Learn the proper way to hold your STIHL tool and how to work on a variety of terrain types to achieve the best results.

STIHL grass trimmer in use on a lawn

Why Safety Equipment Matters

Working with powerful tools is rewarding, but only when done safely. Always wear personal protective equipment (PPE) when using your trimmer or brushcutter — including a helmet, safety glasses, gloves, cut protection trousers, and boots.

Your product's instruction manual outlines specific PPE requirements. Before every use, check your tool is in perfect condition. Your local STIHL dealer can help set up your machine and recommend suitable protective clothing that fits comfortably.

Note: Personal protective equipment is essential but does not replace safe working practices.

Shop STIHL PPE →

How to Put on a Grass Trimmer with Harness

Before trimming, make sure your harness fits correctly. A properly adjusted harness balances the tool's weight evenly across your shoulders and back, reducing fatigue and improving control.

Incorrect harness adjustment can make the trimmer unstable and increase strain. Ask your dealer for help fitting it correctly the first time.

Woman wearing safety glasses trimming grass with a STIHL FS 240 and shoulder harness

Basic Grass Trimming Technique

Even for first-time users, trimming grass with a STIHL trimmer is simple and effective. The basic motion is a smooth semicircular sweep from right to left while moving forward slowly. This method ensures that cuttings fall onto the mown area, keeping your workspace tidy.

Woman trims tall grass with a STIHL FSA 57 cordless trimmer in a garden

How to Use a Grass Trimmer in Tall Grass

For tall grass or dense weeds, use a two-stage technique:

  • First, sweep from left to right at a higher level to cut the tops.
  • Then, sweep back right to left near the ground to finish the cut.

This method reduces strain on the motor and helps distribute clippings evenly.

Woman using STIHL FS 240 grass trimmer with face protection beside a lake

Working on Large, Level Areas

When tackling large, flat areas, use the quadrant method:

  • Divide the area into smaller sections.
  • Work methodically from the outer edges toward the centre.

This approach improves consistency and ensures no patches are missed.

Person mowing a large flat area with a STIHL FS 230 grass trimmer

Using a Grass Trimmer on Hills and Slopes

Always trim across slopes, not down them. Work in horizontal strips from one side to the other. When you reach the end of a strip, move up and cut another strip above it.

This method is safer, reduces slipping hazards, and keeps cuttings contained in the mown area.

Person cutting grass across a slope using a STIHL FS 240 brushcutter

Dealing with Obstacles and Borders

A string trimmer is ideal for cutting close to trees, fences, and shrubs. To protect bark and surfaces, use the trimmer guard as a guide and keep the line slightly angled.

For trees planted close together, trim a border around each trunk before mowing. Use the same technique for neat lawn edges along fences and flower beds.

Close-up of STIHL FS 240 trimming close to a tree base

Operating Instructions and Dealer Support

Always read your STIHL product's operating instructions before use. You can download manuals online or visit your local STIHL Approved Dealer for expert advice, fitting support, and safety product demonstrations.

Download Operating Instructions →   Contact Gustharts →

Summary: How to Use a Grass Trimmer Safely

  • Always wear the correct PPE according to your tool's instructions.
  • Ensure your harness fits properly for safe and comfortable operation.
  • Use a right-to-left sweep for efficient cutting.
  • For tall grass, trim in two passes — high then low.
  • Use the quadrant method for large areas.
  • Work across slopes rather than down for stability.
  • Trim around trees and borders carefully using the guard for guidance.

Shop Strimmer Accessories

Browse mowing heads, lines and guards to keep your grass trimmer working correctly.

Shop Now

Recommended Products

STIHL AutoCut C 6-2 Mowing Head
STIHL AutoCut C 6-2 Mowing Head

Automatic feed head for smooth, consistent trimming.

View Product
STIHL CF3 Pro High-Tech Mowing Line
STIHL CF3 Pro High-Tech Mowing Line

Premium mowing line offering superior cut quality.

View Product
STIHL Guard for Line Mowing Heads & PolyCut
STIHL Guard for Line Mowing Heads

Safety guard accessory to fit on strimmers.

View Product
STIHL DuroCut Line Pieces L
STIHL DuroCut Line Pieces L

Spares for DuroCut trimmer heads.

View Product