How to Use a Strimmer Safely

What is a Strimmer and Why is Safety Important?

A strimmer uses a rapidly spinning nylon line to cut grass and weeds. The line rotates at speeds up to 8,000 RPM, which means it can fling stones, glass, and wire with enough force to break windows or cause deep cuts. The most common injuries from strimmers are eye injuries, lacerations to the legs and feet, and hearing damage from prolonged use without ear protection.

Beyond personal injury, an incorrectly used strimmer can damage plants, strip bark from trees, and even sever underground cables or sprinkler lines. Following proper safety protocols protects both you and your property.

Essential Safety Gear for Strimmer Use

Before you start the engine, make sure you are wearing the correct personal protective equipment (PPE). Owner reviews consistently show that skipping gear is the number one cause of avoidable accidents.

• Safety glasses or visor: Flying debris is the biggest hazard. A full-face visor also protects against line fragments if the line snaps.
• Hearing protection: Petrol strimmers can exceed 100 dB. Even battery models are loud enough to cause hearing damage over time. Use ear defenders or plugs.
• Long trousers and sturdy boots: Denim or work trousers stop minor impacts. Steel-toe boots protect your feet from the line and from dropped tools.
• Gloves: Reduces vibration and protects against blisters and cuts when handling the line.
• Hard hat (optional): Recommended if you are trimming under trees or on uneven ground where falling branches are a risk.

Pre-Operation Checklist: Inspect Your Strimmer and Work Area

Take five minutes before each use to run through this checklist. It is the single most effective way to prevent accidents.

Inspect the Strimmer

• Check the cutting line is the correct diameter for your model. Using a line that is too thick can overload the motor and cause the head to shatter.
• Ensure the guard is securely fitted and not cracked. Never run a strimmer without the guard.
• For petrol models, check for fuel leaks and ensure the air filter is clean. A dirty engine can stall unexpectedly.
• For battery models, confirm the battery is fully seated and the release latch is engaged.

Clear the Work Area

• Walk the area and remove stones, sticks, toys, garden hoses, and any hidden wire or cable.
• Mark any sprinkler heads, edging stones, or tree roots you want to avoid.
• Keep children, pets, and bystanders at least 15 metres (50 feet) away.

How to Start a Strimmer Safely

Starting a strimmer is when most accidents happen because the user is off-balance and the machine is at full throttle near the ground.

• Place the strimmer on flat, level ground. Ensure the cutting head is clear of grass and debris.
• For petrol models: prime the bulb, set the choke, and pull the starter cord firmly but smoothly. Never wrap the cord around your hand.
• For battery models: insert the battery, press the safety lock, then squeeze the trigger.
• Let the engine idle for 10-15 seconds before applying throttle. Do not rev the engine while the head is touching the ground.

Safe Operating Technique: How to Hold and Move the Strimmer

Your body position and movement pattern determine both safety and cut quality.

• Stance: Stand with your feet shoulder-width apart, knees slightly bent. Keep your back straight and avoid leaning forward.
• Grip: Hold the handle with both hands. Your dominant hand should be on the main handle, your other hand on the auxiliary handle or loop.
• Sweeping motion: Swing the strimmer in a wide, steady arc from side to side. Keep the cutting head parallel to the ground and at a consistent height.
• Cutting height: The line should contact only the top third of the grass or weeds. Never dig the head into the ground; this can throw debris and damage the line.
• Direction: Work from the edges inward. Trim along fences and walls first, then move to open areas.

Mistakes to Avoid When Using a Strimmer

Aggregated owner reviews from retailers like Amazon and Toolstation reveal these common errors:

• Cutting too low: Trying to scalp the lawn by lowering the head to ground level. This throws soil and stones and wears the line rapidly.
• Using the wrong line: Round line for general grass, star or serrated line for thick weeds. Using heavy line on a light-duty strimmer can burn out the motor.
• Overreaching: Stretching to reach a patch of weeds instead of moving your feet. This leads to loss of balance and the head swinging toward your legs.
• Ignoring the guard: Removing the guard because it "gets in the way." The guard is your primary defence against flying debris.
• Trimming in wet grass: Wet grass clumps and clogs the head, causing the line to stop spinning and the motor to overheat.

What to Check Before Buying a Strimmer

Safety starts with choosing the right tool for your garden. Consider these factors when shopping:

• Power source: Battery models are lighter, quieter, and start instantly. Petrol models offer more power for heavy weeds but require more maintenance and produce fumes.
• Weight: A strimmer over 5 kg will fatigue your arms quickly, increasing the risk of losing control. Look for models under 4 kg for regular use.
• Line feed system: Bump-feed heads are common but can jam. Automatic feed heads are more convenient but cost more.
• Handle design: A loop handle is fine for small gardens. A bicycle-style handle gives better control on larger strimmers.
• Brand reliability: Stihl, Makita, and DeWalt consistently receive high marks for build quality and parts availability. Budget brands like Einhell offer good value for occasional use.

Battery Safety and Storage

Lithium-ion batteries require specific care to avoid fire risk. Always use the charger supplied with the tool. Do not leave batteries on charge unattended or overnight. Store batteries at room temperature, away from direct sunlight and moisture. If a battery is damaged or swollen, dispose of it at a recycling centre immediately.

Maintenance Checks That Keep You Safe

Regular maintenance prevents mechanical failures that cause accidents. After each use, clean the cutting head and guard of grass buildup. Check the line for cracks or wear and replace it if necessary. For petrol models, inspect the fuel lines and air filter monthly. Sharpen or replace the cutting blade (if fitted) according to the manufacturer's schedule.