A cedar hedge looks dense and green only if you cut it right, and only if you cut it every year. I've seen too many hedges on St. Catharines properties go bare at the base because the previous cuts were flat-topped or neglected. In this guide, I'll walk you through what cedar hedge trimming actually is, why timing matters, and how I keep yours thick from bottom to top.
What cedar hedge trimming actually is
Cedar hedge trimming is the annual pruning of your cedar or arborvitae hedge to maintain its shape, density and health. Unlike a casual haircut, proper trimming follows one critical rule: the top must be narrower than the bottom. This taper is not decoration. It's how light reaches the lower foliage so those branches stay green and full instead of turning into bare wood.
When I trim a hedge, I'm not just cutting off the top growth. I'm shaping both the windward and leeward faces so every part of the plant gets enough sun. A hedge cut flat or wider at the top will shade its own base, and once those lower branches go bare, they never come back. You end up with a wall of stems and a strip of green on top, which defeats the purpose of having a hedge at all.
The work requires hand pruners, hedge shears and sometimes a powered trimmer, depending on the size and condition of your hedge. Every branch clipping gets cleared away before I leave your property, so you're not left raking debris for weeks.
Why it matters in St. Catharines neighbourhoods
Cedar hedges grow fast in Ontario's climate, and that growth is both a blessing and a trap. Left untrimmed for even one season, a hedge becomes leggy and uneven. Miss two years and the base starts to thin. The problem is that once the lower branches lose their leaves, they rarely regenerate. You can't just cut it back hard and expect it to fill in again like you could with a deciduous shrub.
Regular trimming prevents this. It keeps the plant compact, encourages branching at every level, and maintains the dense screen you planted it for. If your hedge has already gone bare at the base, I can bring the height down over two seasons, which gives the lower branches a chance to catch light and recover. Doing it all at once would leave you with an ugly skeleton for months.
On the lake side of St. Catharines, I also watch for winter burn on the windward face. It looks like disease but it's not. Cold, dry wind scorches the exposed foliage, turning it brown or grey. It recovers on its own in spring, but knowing the difference keeps you from panicking or treating a healthy hedge like it's sick.
When to do cedar hedge trimming?
I trim cedar hedges once a year, ideally in late spring after the new growth has hardened off but before the heat of midsummer. This timing lets the hedge recover and send out fresh foliage before winter. If your hedge has gotten away from you and is much taller or wider than you want, I'll do the first major cut in late spring and a second lighter trim in late summer to bring it down gradually without shocking the plant.
Watch for these signs that your hedge needs trimming: the top is wider than the base, growth is uneven or ragged, or you can see bare branches inside the canopy when you part the foliage with your hand. If the hedge is brown or grey on the windward side in winter, don't panic. That's winter burn, not disease, and it will green up on its own. But if the base is thinning or you can see right through to the property line, it's time to call.
The best time to book is in spring, but I can trim hedges into early autumn if the weather cooperates. Avoid late fall or winter trimming because new cuts are vulnerable to freeze damage and the hedge won't have time to harden off before cold sets in.
How I work in Facer Street
When you call me at (289) 273-6745, I'll ask about your hedge's size, condition and what you want to achieve with it. If it's overgrown or you're not sure what to do, I can visit to assess it in person and give you a free estimate. That conversation tells me whether a single trim will do or if we need a two-year plan to bring it back safely.
On the day of the work, I arrive with my truck, hand tools and a chipper or trailer for debris. I start by walking the length of the hedge to see the overall shape and any problem areas. Then I taper both faces, working so the top is narrower than the bottom. I check the windward side for winter burn or damage and trim around it. As I work, I clear clippings into piles that get chipped or hauled away before I leave. You won't find a mess on your property.
If your hedge is very overgrown, I'll explain what's realistic in one season and what needs a second pass. I won't promise to fix a neglected hedge in a single cut because that would damage it. My job is to leave it healthier and denser than it was, and sometimes that takes patience.
The situations I run into
Cedar hedges come in different situations, and each one is trimmed a bit differently. A mature, well-maintained hedge that's been cut every year is straightforward: I taper the faces, clear the clippings and you're done until next year. An overgrown hedge that hasn't been touched in several years needs a longer conversation. I might bring the height down 30 to 60 centimetres in the first year and another 30 centimetres the next, giving the lower branches time to fill in as they get more light.
Hedges on the lake side of St. Catharines sometimes show winter burn, especially on the north or west faces that take the full wind. This looks alarming but it's not disease and it's not permanent. I'll trim around it and let the plant recover naturally. Hedges planted in clay soil or in a windswept spot may also grow unevenly. I account for that in the taper so the sheltered side doesn't shade out the exposed side.
Some hedges have been topped flat for years and have no lower density at all. Those are the hardest to fix, but it's not impossible. It just takes two or three seasons of careful tapering to encourage the base to branch out again. The key is patience and the right cut every year.
