Grass trimmer with knife test 2020: the best models in comparison

Types of grass trimmers with knives

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LUX-TOOLS A-RT-20/26 cordless grass trimmer set with telescopic handle, plant protection bracket and a cutting circle of 26 cm incl. 2.0Ah battery & charger | 20V grass trimmer with 10 plastic cutting blades

49.99 EUR To the product

There are basically three types of grass trimmers that can be operated with knives:

• Lawn trimmer (€ 33.48 at Amazon *) with electric drive (power cable)
• Cordless lawn trimmer
• Gasoline powered grass trimmer

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These are also the grass trimmers that are generally available. Each of these types can alternatively be used with a thread - this is the second cutting tool that comes into consideration besides the knives.

In this article, we want to deal more with the properties of knives in grass trimmers. For more information about the grass trimmer variants in and of themselves, read our detailed guide to all things grass trimmers.

Buying guide grass trimmers

Further purchase criteria

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FIXKIT cordless grass trimmer (1H fast charge, 20V Li-battery, 2 Ah, 230 mm cutting circle, 180 ° trimming angle, 10 plastic blades)

71.99 EUR To the product

When buying a lawn trimmer with a knife, you should consider the following two criteria in particular:

• Type of knife
• Material of the knife

All other purchase criteria for a grass trimmer can be found in our comprehensive guide on the subject.

Type of knife

Basically, mowing, grass and thicket knives for grass trimmers are available.

• Mower and grass blades for cutting less complicated lawns.
• Thicket knife for shortening rough areas.

Material of the knife

The blade of a grass trimmer is made of either metal or plastic.

Versions made of metal are on the one hand more robust and on the other hand more powerful - but they also cost more than plastic knives.

How do I care for a grass trimmer with a knife?

By and large, just like you care for string trimmers. Our general guide to the trimmers provides you with all the care instructions.

The main thing you need to do with a blade trimmer is to keep the cutting tool sharp. Otherwise it cannot perform to its full potential. Sharpen it if it looks dull.

Which accessories are useful?

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Uvex Pheos forest safety helmet - with hearing protection, visor & neck protection - red

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When working with a knife grass trimmer, wear protective equipment consisting of eye / face / head protection, gloves and safety shoes. The knife blades can break and parts of them become dangerous projectiles as a result of the rotating movement. Risk of injury!

frequently asked Questions

What are the advantages and disadvantages of a grass trimmer with a knife?

A grass trimmer that is equipped with movable metal or plastic knives has certain advantages and disadvantages due to the specific cutting tool. These pros and cons apply in comparison with classic string reel grass trimmers.

It is advantageous that a grass trimmer with a knife can also shorten somewhat thicker undergrowth - the gardener usually despairs this with a thread trimmer.

There are two disadvantages to this advantage: the knives can break easily and replacement knives are relatively expensive. In addition, the knives are not suitable if you want to cut or remove grass on walls or house walls. The cutting tools quickly leave damage such as scratches on the surfaces or break themselves.

The pros and cons of a grass trimmer with a knife at a glance:

advantages

• also masters herbaceous plants on the lawn

disadvantage

• Knives break easily
• Replacement knife relatively expensive
• Knives quickly damage sensitive surfaces (terrace floors
• Wall
• House wall et cetera)

Who benefits from a lawn trimmer with a knife?

Hobby gardeners who not only have to cut relatively easy-care lawns in their green oasis, but also have to struggle with herbaceous plants, definitely benefit from a grass trimmer with a knife. This cutting tool is often better at handling the unruly lawn areas than a trimmer with string.

Tips

With some grass trimmers, you have the option of changing the cutting systems as required and at will using appropriate attachments - i.e. knife and thread. It is interesting that when using knives lower speeds have to be achieved than when using a line, so that you can also use a grass trimmer with a lower power if you prefer the knife as a cutting tool.