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A petrol grass trimmer is designed for cutting down large areas of long grass and weeds, and is one option for working away from the house. 

Unlike cordless electric models, which need recharging regularly, all you need is a can of petrol and you can work for hours at a time. Petrol trimmers are ideal for gardeners who need to clear an allotment or cut down a wildflower meadow. 

However, don't expect them to be suited to all trimming tasks. They are much too powerful and hard to control to edge the lawn, for example. 

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Petrol machinery has a reputation for being hard to start and tricky to maintain, and this is sometimes justified. However, some petrol grass trimmers have easy-start engines that simplify the start-up routine and don't need as much force to work the pull cord. 

Most petrol trimmers also have an anti-vibration mechanism, although these tend to reduce vibration rather than eliminate it, and petrol engines are by their very nature noisy and give off exhaust fumes. 

They are also usually heavier than most cordless electric grass trimmers - unless the cordless model has a large and heavy battery. 

You can expect most petrol grass trimmers to weigh at least 4kg.

However, some models do come with a harness or shoulder strap, which will help to reduce the strain on your arms. 

Petrol trimmers typically cost from £100 for a basic model up to around £700 for a high-end professional model. 

We've tested petrol grass trimmers from six major brands including Honda, Ryobi and Stihl. Find out about these and other manufacturers with our grass trimmer brand guide .