Start with the space you actually have

Small gardens change the maths of tool buying. On a six-by-four metre plot you are not clearing forty metres of leylandii; you are tidying a metre of box beside the gate, a low lavender hedge along the path, and perhaps a privet boundary you share with next door. That shifts the priorities. Weight, balance and control matter far more than raw cutting power, and a machine that feels sensible on a large plot will feel absurd here.

Before you compare anything, measure. Note the total run of hedge in metres, the average height, and the thickest stems you will realistically be cutting. Then check whether your outdoor socket reaches. A trimmer that is too small will stall on every pass; one that is too big will sit in the shed because you cannot face lifting it.

Corded trimmers: light, keenly priced and quietly effective

For most small UK gardens, a corded electric trimmer is the sensible starting point. Typical models run 450–600W, weigh around 2.5–3.5kg, and carry a 45–60cm blade. They produce roughly 85–90 decibels, which is loud enough to warrant ear defenders during a long session but nothing like a two-stroke.

• Strengths: constant power with no battery fade, low weight, the lowest purchase price, almost no maintenance beyond cleaning.
• Weaknesses: the cable. You will need an outdoor socket, an extension lead rated for the load, and an RCD for safety. Ten metres of cable soon runs out at the bottom of a long garden.
• Best for: hedges within reach of the house, front garden topiary, and anyone who cuts little and often rather than in marathon sessions.

Buy a brightly coloured lead and keep an eye on where it drapes. Most accidents with corded trimmers are cable accidents, not blade accidents.

Cordless trimmers: the all-rounder for a small plot

Battery trimmers have quietly become the default choice, and for good reason. An 18V to 36V machine weighs between 2.5kg and 4kg depending on the battery fitted, runs for thirty to sixty minutes per charge, and usually comes with a 45–65cm blade. Noise sits in the 75–90 decibel range, so you can cut on a Sunday morning without annoying the neighbours.

If you already own other cordless garden tools, staying on the same battery platform is the single best money-saving decision you can make. Two batteries and one charger will cover a season in a modest garden.

• Strengths: no cable to drag or slice, fast to grab for a ten-minute tidy, usable anywhere in the garden.
• Weaknesses: output drops as the battery drains, and cold weather shortens runtime noticeably — worth remembering if you cut in late winter.
• Best for: nearly every small garden, particularly where storage is tight and there is no convenient socket.

Petrol trimmers: rarely the right answer here

Petrol models make sense for long boundaries, heavy growth and sites with no power. In a small garden they rarely earn their place. Expect 20–30cc engines, 4–6kg of weight, and 95–105 decibels — genuinely uncomfortable without proper ear defenders. Add two-stroke mixing, exhaust fumes, fuel that goes stale over winter, and the annual battle to get it started in spring, and the appeal fades quickly.

There is one exception worth naming: a long rear boundary hedge at the far end of a garden with no outside power and no appetite for batteries. Otherwise, leave petrol to the professionals.

Matching the blade to the hedge

Blade length and tooth spacing decide what a trimmer will actually cut well. A blade much longer than your hedge height is wasted weight; too short and you will be forever sweeping back and forth.

• Box, yew and other fine hedging: a 45–50cm blade with a 15mm tooth gap gives a crisp, tight finish.
• Privet, laurel and escallonia: a 55–60cm blade with a 20–25mm gap, and a little more power behind it.
• Conifer and leylandii: 60cm or more with a 25mm-plus gap. If the growth is woody, cut it back with loppers first — a trimmer should be shaping, not sawing.
• Lavender, rosemary and hebe: these resent being chewed. Use hand shears and cut after flowering, or a trimmer on its lightest setting only.
• Berberis and pyracantha: thorny and dense. Choose a powerful cordless or corded model, wear thick gloves and eye protection, and expect to sharpen regularly.

Storage, safety and a little maintenance

Think about where the tool will live before you buy. Corded models hang neatly on a shed hook by their handle; a wall bracket keeps the blade off the floor and out of damp. Store batteries indoors, charged to roughly half, and they will last far longer than if they sit in a cold shed all winter.

Clean sap off blades after each use with an oiled rag, and touch up the cutting edges with a file or replace the blade when it starts tearing rather than slicing. Wear goggles and gloves every time, and ear defenders above around 85 decibels.

One final piece of timing. In the UK, hedges are prime nesting habitat between March and August, so give them a proper cut in late winter and light trims only after the breeding season. It is better for wildlife, and it is also the law.