You are standing in front of a hedge with a gap in it, a patch that has thinned out or gone bare and shows no sign of filling back in on its own. The good news is that most hedges can recover from this, but whether yours will, and how you go about it, depends on two things: what caused the gap in the first place, and whether your particular species can regrow from bare wood. This article walks through what makes a hedge go bare, which plants bounce back and which do not, and the practical fixes that bring a Sydney hedge back to full, even cover.
Most bare patches in hedges come down to shading, water or root competition, pest or fungal damage, or cutting back into old wood. Whether the gap fills in depends on whether the species reshoots from bare wood. Lillypilly, photinia and murraya usually recover well, while conifers such as cypress generally do not regrow once a section has gone bare.
What causes a hedge to go bare
Before you can fix a gap, you need to know what caused it, because the fix follows the cause. Most bare patches trace back to one of five things, and each leaves its own signs.
- Shading: a section that sits in the shade of a tree, a building or the hedge’s own overgrown top thins out, because the inner and lower growth is not getting the light it needs. Bare patches on the shaded side or underneath an overhang point to this.
- Water and root competition: a nearby tree or large shrub draws water and nutrients away from that stretch of hedge, leaving it starved. A gap that lines up with a big tree’s root zone is often this.
- Soil compaction: ground that has been walked over, parked on or built up around the base goes hard, and roots struggle in it. A hedge that thins along a path or driveway edge is a classic case.
- Pest and fungal damage: scale, borers or a fungal problem can kill off a section, often leaving discoloured leaves, sticky residue or dieback before the patch goes fully bare.
- Cutting into old wood: trimming back harder than the plant can respond to, into the bare inner wood, leaves a gap on any species that does not reshoot from it.
Work out which of these fits your hedge before you reach for the secateurs, because treating the wrong cause just wastes a season.
Will it grow back? Species matters most
This is the question that decides everything, and the honest answer depends almost entirely on what your hedge is. Some plants reshoot readily from old, bare wood, while others simply will not, and no amount of feeding or watering changes that.
| Usually reshoots from old wood | Generally does not reshoot |
| Lillypilly | Conifers |
| Photinia | Cypress |
| Murraya | Most junipers |
| Viburnum | |
| Box |
If your hedge is on the left of that table, the odds are good. These plants will push new growth from bare stems when conditions are right, so a gap can genuinely fill back in with the correct treatment and patience. If it is a conifer, cypress or juniper, the hard truth is that a bare section is usually permanent, because these plants carry their growth on the outer green and have little or no capacity to reshoot from the brown wood underneath. Cut a conifer back past the green and that part generally stays bare for good. Knowing which camp your hedge falls into saves you a lot of wasted effort, because it tells you straight away whether you are looking at a repair job or a replacement one. If you are not sure what species you have, that is worth confirming before you decide what to do.
Fixing a bare base
A hedge that has gone bare along the bottom is one of the most common complaints, and it almost always comes back to light. The base is thinning because the top of the hedge has grown out and is shading the bottom, so the lower growth is starved of the sunlight it needs to stay full.
The principle that fixes this is shaping the hedge so it is slightly wider at the base than at the top, which is often called an A-shape or a batter. Keeping the bottom a touch wider than the crown lets light reach the lower foliage instead of the top overhanging and shadowing it. In practice that means easing off the width at the base and bringing the top in a little when you trim. Alongside the shaping, a skirt prune to lift any growth sitting on the soil, a good layer of mulch to hold moisture and feed the soil, and consistent watering all help the base push new growth. On a species that reshoots, a bare base treated this way will usually thicken back up over a season or two once the light and the feeding are sorted.
Fixing a bare middle or one-sided hedge
A gap in the middle, or a hedge that has gone thin down one side, calls for a more patient approach than a quick trim. On a species that reshoots, the proven method is staged renovation pruning, spread over two to three seasons rather than done all at once.
The idea is to prune back hard on one section or one side at a time, let it recover and reshoot, then do the next part the following season. This keeps the hedge functioning as a screen while it rebuilds, rather than butchering the whole thing at once and leaving yourself with a bare fence for a year. Feeding matters here too, because you are asking the plant to put on new growth, so a balanced feed at the start of the growing season gives it the fuel to do it. There is also a quicker trick for some gaps: where you have healthy growth on either side of a hole, you can sometimes tie in neighbouring stems to train them across the gap, which fills it faster than waiting for new shoots to come from scratch. Which approach suits depends on the size of the gap and how much healthy growth sits around it.
When to replace rather than repair
Sometimes the honest answer is that a hedge, or part of it, is past repairing, and knowing when to stop trying saves you two wasted seasons. A few clear signals point to replacement over repair:
- The root system is dead: if the wood is dry and brittle and nothing green remains in that plant, it is gone, and no pruning brings it back.
- More than about a third of the hedge is bare: past that point, renovation leaves you with such a sparse screen for so long that starting fresh is often the better outcome.
- The species will not reshoot: a bare conifer or cypress section will not regrow, so repair is not on the table for that gap.
- The gap has been open more than two seasons: a hole that has sat empty that long usually signals an underlying problem that will keep the patch bare.
When replacement is the right call, matching the new plants to the existing hedge and getting them established well is what makes the repair invisible in a couple of years. This is also the point where bringing in professional hedge trimming in Sydney is worth it, because a staged renovation or a part-replacement done properly, with the right cuts at the right time, is what turns a patchy hedge back into a solid screen. Any quote for that work is guide only, subject to a free on-site assessment of the hedge.
Timing in Sydney
When you do the work matters as much as how you do it, because a hedge recovers far better when it is pruned and fed at the right time of year. In the Sydney climate, the best window for renovation pruning is through the warmer growing months, roughly spring into early autumn, when the plant has the energy and the conditions to push new growth quickly.
Feeding is best timed to the start of that growing season, so the plant has nutrients available just as it begins to shoot. The time to avoid hard pruning is the peak heat of January and February, because cutting a hedge back hard and exposing inner growth during a Sydney heatwave stresses the plant and can scorch the newly exposed foliage. A light tidy is fine year-round, but save the serious renovation cuts for the milder, actively growing periods. Get the timing right and the same cut that would struggle in midsummer recovers strongly in spring.
Common questions about bare patches in hedges
Will a bare patch in a hedge grow back?
Usually yes, if the species reshoots from old wood and the underlying cause is fixed. Lillypilly, photinia, murraya and box recover well, while conifers and cypress generally do not regrow once a section has gone bare.
How long does a hedge take to fill in a gap?
Typically one to three growing seasons, depending on the species, the size of the gap and the conditions. Faster-growing hedges on a species that reshoots fill in quicker, especially once the light, water and feeding have been corrected.
Can you cut a hedge back to bare wood?
Only on species that reshoot from old wood, such as lillypilly, murraya and box, which can be renovated hard in stages. Cutting a conifer or cypress back to bare wood usually leaves a permanent gap, so it is not advised.
Why is my hedge bare at the bottom?
Almost always because the top has grown out and is shading the base. Shaping the hedge slightly wider at the bottom than the top lets light reach the lower growth, which, with feeding and watering, allows the base to thicken again.
What causes a hedge to die in the middle?
Commonly, shading, water and root competition from a nearby tree, or a pest or fungal problem taking hold in that section. Identifying which applies is the first step, because the fix depends entirely on the cause.
Should I replace one plant or the whole hedge?
If a single plant has died but the rest is healthy, replacing just that one and establishing it well is usually enough. Replace the whole hedge only when a large share has failed or the species will not reshoot to fill the gaps.
Bringing a patchy hedge back
It comes down to three steps. Work out what caused the gap, check whether your species reshoots from bare wood, then either renovate it in stages over a couple of seasons or, where the plant is dead or will not recover, replace the affected section. Handled that way, most Sydney hedges come back to a full, even screen. If you would like someone to look at your hedge and tell you honestly whether it will recover, A1 Gardening and Landscaping Sydney offers a free on-site assessment, so you know whether you are repairing or replacing before you start.
