By Aps Tree Removal · · Updated
Api Mariner, Qualified Arborist · 12 min read
Most Melbourne homeowners can do their own garden hedge trimming, and do it well. The hedges that go wrong are not the ones cut by amateurs; they are the ones cut in the wrong order, in the wrong month, with the top wider than the base. This is a hands-on guide to how to trim a hedge properly: the tools, the sequence, the shape that keeps a hedge green to the ground, the aftercare, and the mistakes that cost a season. It ends with the honest line between a weekend job and one for an arborist.
Api Mariner is a qualified arborist who has trimmed hedges across Melbourne's west and inner suburbs for more than 16 years, and who spends a fair part of each spring repairing hedges that were trimmed with enthusiasm and no string line. The method below is what he shows customers who want to keep the small hedges themselves.
The tools for trimming your own garden hedge
You do not need much, but what you have needs to be sharp.
A garden hedge trimming kit
- A hedge trimmer with sharp, clean blades: petrol or battery for anything over a few metres
- Hand shears for the finishing pass and for small box or murraya
- Bypass secateurs and loppers for anything thicker than a pencil
- A string line and two stakes for a level top
- A tarp or old sheet to catch clippings along the base
- A rake and a blower or stiff broom
- Eye protection, gloves and ear protection for a petrol trimmer
Blunt blades tear rather than cut, and torn tips brown off and invite disease into the hedge. Sharpen or replace the blades before the season, clean sap off after each use, and oil them. A trimmer that snags and bounces is telling you it is blunt, not that the hedge is tough.
One tool that should not be on the list is a ladder. Safe Work Australia's guide to tree work, which covers trimming and pruning amenity trees, states that tree trimming or removal work should not be done from ladders [6]. If you cannot reach the whole top from the ground, the hedge has grown past a weekend job.
Garden hedge trimming step by step: how to trim a hedge
The order matters more than the tool. Cut the sides before the top and the batter takes care of itself; cut the top first and you have nothing to reference.
Trimming a garden hedge in the right order
- 1Check the plant and the dayWhich species is it, and is this its month? Is today mild and still? A heatwave or a windy day is not a hedge day.
- 2Set the string lineStakes at each end, the line pulled tight at the height you want. Stand back and check it is level against the fence or the house, not against the hedge.
- 3Sides, bottom upTrimmer blade flat to the face, sweeping upwards in overlapping arcs, leaning the face in very slightly as you rise so the base stays a touch wider than the top.
- 4Top, to the lineBlade flat, walking the line, taking off the growth above it and no more. On a rounded top, follow the curve by eye with the line as the high point.
- 5Step backLook at the hedge from ten metres and from the corner. The eye catches a dip or a lean that the trimmer never sees. Refine with shears.
- 6Rake, blow, mulchClippings off the top, out of the base, off the lawn. Water if the soil is dry. Mulch the root zone, clear of the stems.
Gardening Australia's Jane Edmanson gives the rule for growing a hedge in the first place, and it applies to every trim afterwards: plant about a metre apart, trim a little and often so the plants bush up, and cut the tops level early rather than waiting for the hedge to reach the height you want [1]. Every light cut into new growth makes the hedge branch behind the cut. That is where density comes from, not from the trimmer.
Got the job done! They arrived on time, trimmed the pine trees for a good hedge - looks neat, and tidied up after the job was done. Would recommend them
Getting the shape of a hedge right
The shape is the part of garden hedge trimming that decides how the hedge looks a year later, and it comes down to one idea.
Wider at the base than the top. A hedge that is plumb, or worse, wider at the top, shades its own lower growth. The bottom leaves get no light, they thin, and the base goes bare. A face that leans in slightly as it rises, a batter, lets light reach the whole face and keeps the hedge green to the ground. It is a few degrees, not a wedge, but it is the difference between the hedge that gets admired and the one with bare legs.
Flat or rounded on top? Either works with a batter. A flat top is the formal look and needs the string line every time to stay level. A gently rounded top is more forgiving of a wandering eye, sheds debris better, and suits informal and native hedges. What does not work is a top that is wider than the sides, whatever its shape.
Corners and ends. Trim the ends square by running the line around the corner, and step the ends back slightly so they do not look heavier than the face. Corners are where a hedge reads as cared for or not.
What you should know about the batter
Check it from the end of the hedge, not the front. Stand at one end and sight along the face: the base should step out very slightly beyond the top. If the top is wider, take more off the top on this trim and a little more each time until the base catches up, rather than trying to fix it in one cut.
When to trim your garden hedge in Melbourne
The right month comes from the plant. Melbourne's growth pattern is set by its climate: the Bureau of Meteorology's Melbourne Airport averages show mean maximums of 26.7 degrees in January and February falling to 13.2 degrees in July, with the wettest months in spring at 62.4 mm in November and 55.7 mm in October [5]. Hedges flush hard from spring into early summer and rest in winter.
| Hedge | Firm cut | Light trims | Do not cut |
|---|---|---|---|
| Lilly pilly | Late winter, after frost risk [2] | Spring to autumn, little and often [1] | Hard in midsummer heat |
| Viburnum tinus | Straight after flowering [3] | Summer tidy | Hard in autumn: you lose the flowers |
| Photinia | After flowering [3] | Spring and summer | In a heatwave: the red flush burns |
| Box, pittosporum, murraya | Late winter to early spring | Spring to autumn, lightly | Hard after years of neglect: stage it |
| Conifers | Within the green, any mild month | Once more in the season | Ever past the green |
| Grevillea, westringia, correa | Autumn, to the end of April [4] | After flowering | While in bud [4] |
Two extra timing rules from Gardening Australia are worth writing on the shed wall: deadhead viburnum straight after flowering every year from planting to keep it compact to the ground [3], and never prune a native while it carries flower buds; wait until flowering finishes, then prune back by about a third [4]. How often a hedge needs cutting is a species question, but two to four light trims a year covers most formal garden hedges.
Got a hedge that has grown past a weekend job, or want Api to set the shape so you can maintain it yourself? He quotes for free, 7 days a week.
The common hedge trimming mistakes, and the fix for each
Every one of these comes from a hedge Api has been asked to repair.
Garden hedge trimming: what goes wrong and what to do instead
Do this
- Cut the sides first, bottom up, then the top to a string line
- Keep the base a touch wider than the top
- Trim little and often, in the plant's season
- Sharpen the blades and cut on a mild, still day
- Rake the clippings off the top and out of the base every time
- Look up for the service line before you start
Not this
- Cut the top first and guess the sides
- Let the top grow wider than the base
- Cut a conifer past its green or a viburnum hard in autumn
- Trim in a heatwave or high wind with blunt blades
- Leave clippings on the hedge to brown off
- Reach into a boundary hedge with a service line running through it
The service line is the mistake with the highest stakes. For a hedge on your property, you are responsible for keeping it clear of the line that feeds your house, and Energy Safe Victoria says to clear growth before it comes within one metre of the insulated line in any direction [7]. It also advises against pruning at all in high winds [8]. A trimmer blade meeting a service line hidden in a boundary conifer is not a gardening mistake; it is an electrical one, and anything near street powerlines is for authorised contractors only [8].
The shape mistakes are covered above. The season mistakes are the ones that show months later: a viburnum cut hard in autumn gives you a spring with no flowers, a lilly pilly cut hard in a January heatwave sits scorched and bare, a conifer cut past the green carries the brown hole forever. If you are unsure which category your hedge is in, the guide to hedge trimming and pruning covers each species in depth.
Api's been amazing in helping us remove hedges off our property. He is quite honest, friendly & reasonable,always wiling to share the best advise for customer. Definitely recommend him to evwryone.
Aftercare: the part of the job that decides next year
A trim is not finished when the trimmer stops.
- Clear the top and the base. Clippings left on top brown off in days and shade the surface; clippings in the base shade the lower growth and start the bare-bottom problem. Rake the top, blow or rake the base.
- Water deeply if the soil is dry. A summer trim on a dry root zone is a stress on top of a stress.
- Mulch, clear of the stems. A mulched root zone holds moisture through Melbourne's dry summer and keeps the base cool.
- Hold the fertiliser after a hard cut until the plant is shooting again, then feed lightly.
- Compost or chip. Soft clippings compost; woody prunings from a hard cut are chipped or go to green waste.
Boundary hedges and the neighbour
A shared hedge is trimmed on your side by you and on their side by them, unless you agree otherwise, and the agreement is worth having before the trimmer comes out. Overhanging branches, dropped leaves and root damage are the classic neighbour disputes, and the Dispute Settlement Centre of Victoria runs a free mediation service for exactly these arguments [10]. A conversation over the fence about height, timing and who takes the clippings prevents almost all of them.
When trimming your own garden hedge stops being the answer
Plenty of hedges are a good weekend job for their whole lives. Some grow out of that category, and the signs are clear.
The hedge is taller than you can reach from the ground. It is a conifer that has grown out of the green. It has run away for several seasons and needs a staged reduction rather than a trim. The base has gone bare and the batter needs rebuilding. A service line runs through or near it. Or it is simply too long for a Saturday, and the clippings are more than the green bin will take in a month.
That is where hedge trimming services from a qualified arborist earn their price: platforms instead of ladders, an exclusion zone under the work, the species-by-species knowledge of what will grow back, and a chipper for the waste. Consumer Affairs Victoria's checklist for home jobs applies to choosing one: three quotes on the same description, a written record, and a certificate of currency for public liability insurance on request [9]. Api brings all three.
A hedge you can be proud of
Garden hedge trimming is a craft with about six rules, and every one of them is in this guide: know the plant and its month, set a line, cut the sides from the bottom up, keep the base wider than the top, stay off the ladder, and clean up. Do those on the hedges you can reach and they will look better every year. For the ones you cannot, our hedge trimming service quotes on site for free, and Api will happily set the shape on a hedge so you can hold it yourself from then on. He answers the phone 7 days from 6am.
How you get a garden hedge you can trim yourself and be proud of
Getting a garden hedge you can trim yourself and be proud of does not have to be complicated. At Aps Tree Removal we look at the job with you, tell you what actually needs doing and what does not, and put a fixed price on it before anything is cut.
No pushy sales. Api comes out, walks the property with you, explains the options and what each one means for the result, the risk and the price. You decide at your own pace. People choose us because they understand the job before they book it, and the crew that quotes is the crew that turns up.
We will tell you if a council permit applies and what the process is, we will point out anything near powerlines or the neighbour's boundary that changes the method, and we will say plainly when a cheaper option is the better one. Every job is done by a qualified arborist, fully insured, and the site is left cleaner than we found it.
Get in touch today. Api quotes for free, 7 days, 6am to 5pm, across Melbourne's west, the inner city and Geelong.
How we work with you
We talk and answer your questions
Call 0422 856 090 or send the form. Api asks what is worrying you about the tree, hedge or stump, what access is like, and whether anything sits near powerlines or a fence line.
We look and give you a fixed price
Api visits, inspects the tree or hedge, checks the permit position for your council, and quotes in writing. The price covers the job, the clean-up and the green waste unless we say otherwise.
You decide what works best
Remove, reduce, prune or wait: we explain the difference and what each costs. No pressure, no expiring offers. The choice is yours.
We do the job and stay in touch
The crew arrives when we said, works to the plan, and leaves the site clean. If the tree throws a surprise on the day, we tell you before we change anything.
Frequently asked questions
How do I trim a garden hedge properly?
Check the species and the season, set a string line on the top, cut both sides from the bottom up so the base stays a touch wider than the top, then cut the top to the line, step back and check the shape from a distance, and rake the clippings off the top and out of the base.
What is the biggest garden hedge trimming mistake?
Cutting the top wider than the base. The upper growth shades the lower growth, the bottom thins and dies back, and the hedge ends up bare where you most want it green. Keep a slight batter, a face that leans in as it rises.
Should a hedge top be flat or rounded?
Either works if the base is wider than the top. A flat top gives a formal look and needs a string line to stay level. A gently rounded top is more forgiving, sheds debris better, and suits informal hedges.
How often should I trim my garden hedge?
Formal hedges look best on two to four light trims a year, timed to the species, with the firm cut in the plant's season. Little and often beats one hard cut every few years.
Can I trim a hedge that has grown too tall myself?
Only if you can reach the whole top from the ground. Safe Work Australia's guidance for tree work says trimming should not be done from ladders, and a two-handed trimmer on a ladder is how people get hurt. A tall or overgrown hedge is a job for a platform and, on conifers, a staged reduction.
What do I do with the clippings?
Rake them off the top and out of the base straight away, because clippings left on the hedge brown off and shade the surface. Compost soft clippings or use them as mulch; woody prunings from a hard cut are chipped or taken away.
Sources
- Gardening Australia (ABC): FAQs: hedging lilly pillies (Series 30, Episode 07)
- Gardening Australia (ABC): Pruning Lilly Pillies (Series 19, Episode 32)
- Gardening Australia (ABC): Spring Pruning (Series 29, Episode 36)
- Gardening Australia (ABC): Pruning Natives (Series 27, Episode 03)
- Bureau of Meteorology: Climate statistics for Australian locations: Melbourne Airport
- Safe Work Australia: Guide to managing the risks of tree work (March 2023)
- Energy Safe Victoria: Trees and vegetation FAQ (reviewed 16 March 2026)
- Energy Safe Victoria: Managing trees near powerlines
- Consumer Affairs Victoria: Home improvements costing $10,000 or less: checklist
- Dispute Settlement Centre of Victoria: Neighbour disputes: trees
Information about tree work, council permits and insurance changes often, and every property is different: figures here are general guidance and linked pages may change or become outdated. For a price on your own tree, hedge or stump, call Api on 0422 856 090 for a free quote.
