How to Prune a Cedar Hedge: The Basics Before You Start

Identify your goal before you grab the tools

Before cutting anything, you need to know what you're trying to achieve. The work isn't the same if your hedge just needs a touch-up versus if it's taken over too much space over the years. There are generally six pruning goals to consider:

• maintenance, to keep an already established shape
• training, to give structure to a young hedge
• rejuvenation, to thicken up a sparse hedge
• decorative shaping, for forms like balls, cones, or spirals
• cutback, to reduce an overgrown hedge
• severe pruning, reserved for extreme cases

Each goal calls for a different approach, and that's often where mistakes start: a neglected hedge gets treated like a simple maintenance job, when it actually needs a more gradual plan. You'll find the details of each approach on our pruning types page.

The rule that changes everything: never cut into bare wood

Cedar (thuja) doesn't behave like a leafy shrub that grows back from anywhere. Once a branch is completely stripped of foliage, it usually won't produce new growth. That means an overly aggressive cut, one that goes past the edge of the green foliage, can leave a bare spot that stays visible for a long time, sometimes permanently.

That's why we avoid cutting "blindly" by simply aiming for a target height or width. You first need to look at how far the green foliage extends down each branch, and cut within that zone, never beyond it.

The shape that keeps a hedge dense

A healthy cedar hedge has a base that's slightly wider than its top, somewhat like a trapezoid. This shape lets light reach the lower branches, keeping them alive and full of foliage. A hedge trimmed the opposite way, wider at the top than at the bottom, often ends up thinning out at the base over time, because the foliage on top blocks the light from reaching below.

Dead or diseased branches, and ones that rub against each other, should also be removed first, regardless of the type of pruning you're after. These are weak points that don't do the hedge any favours and can become entry points for plant health issues.

When to prune in Quebec

The pruning season in Quebec runs from mid-April to the end of October. In practice, pruning is mostly done once the year's new growth has come in, meaning from late June through to fall. Cutting too early, before the new growth is visible, makes it harder to judge where to stop without cutting into bare wood.

This window applies across all eight regions served by our network: Montérégie, the South Shore and North Shore of Montreal, Montreal, the Laurentians, the Eastern Townships, Quebec City, and Saguenay-Lac-Saint-Jean. Details by area are available on our service areas page.

When pruning becomes riskier

The more foliage that gets removed, the higher the risk. A hedge that needs a significant reduction in height or width, or one that already shows sparse patches, falls into a different category than simple annual maintenance. This is where we talk about cutback pruning or severe pruning, interventions that need to be done gradually rather than in one drastic cut.

A heavily overgrown hedge, with a lot of bare wood already visible inside, may no longer be a good candidate for simple rejuvenation. In these cases, it's best to honestly describe the hedge's condition in your quote request, so the estimate reflects reality, not just the desired height.

What to describe for an accurate quote

Since the price depends directly on the work involved, the more precise the description, the more accurate the estimate. Here's what affects an estimate:

• the total height and length of the hedge
• the current width and the desired width
• the general condition: dense, sparse, with dead branches
• the type of pruning wanted: maintenance, cutback, rejuvenation, or decorative
• access to the property and obstacles like fences or wires

This information lets you get a written price online, without waiting for an in-person visit. Common questions about how the service works are gathered in our FAQ.

{"q": "How do you prune a cedar hedge?", "a": "You cut while keeping the base slightly wider than the top, always staying within the green foliage and never into bare wood. Dead or rubbing branches are removed first, regardless of the desired outcome."}, {"q": "When should you trim a hedge that's too wide?", "a": "A width reduction is generally done after the new growth has come in, so from late June through fall in Quebec. If the hedge has been very wide for a long time, a gradual reduction over more than one season limits the risk of permanent bare spots."}, {"q": "When should you prune a cedar?", "a": "The pruning season runs from mid-April to the end of October, but the work is mostly done once the year's new growth is visible. Cutting too early in spring makes it harder to tell where the living foliage ends."}, {"q": "When can you transplant a cedar?", "a": "Transplanting isn't a service offered here; this guide covers pruning, not moving an already planted cedar. For any questions about what cedar hedge trimming covers, the pruning types page details the possible interventions."}, {"q": "Do you need an on-site visit to get a price for [maintenance pruning?", "a": "No, Gemme sa taille's online quote gives you a written price in under 3 minutes based on the hedge's dimensions, with no prior visit needed. The service is available in eight regions across Quebec, from Montérégie to Saguenay-Lac-Saint-Jean."} ]

Related reading:

• Cedar Hedge Maintenance: How Often to Trim
• How Much Does Hedge Trimming Cost? The Real Factors to Know
• Cedar Hedge Installation in Sainte-Julie: Where to Start with Pruning

Frequently asked questions