Hedges are a lot like haircuts. Done right, the whole property looks put-together. Done wrong, the neighbours will be noticing it longer than you will — and they'll keep noticing it (and privately judging the topiaries) until you sort it out.
The short answer: to trim a hedge properly in Surrey, use sharp bypass shears or a powered trimmer with clean blades. Work from the bottom up. Keep the base slightly wider than the top so light reaches the lower growth. Stop before you cut into old, brown wood with no green on it.
That's the whole job. Most of what goes wrong comes down to two things: dull blades and no guide string. We'll cover both.
What tools you actually need
Nine out of ten DIY hedge jobs we're asked to fix had the same two problems: blades that hadn't been sharpened since the trimmer was new, and no guide string. Both are cheap to fix.
- Bypass hand shears — not anvil shears. Bypass blades slice cleanly through stems. Anvil shears crush them, which invites disease at every cut point. Use these for anything you can reach from the ground on a shorter hedge.
- Cordless hedge trimmer — for runs longer than a few feet or anything you can't comfortably reach with hand shears. An 18–20 inch blade is manageable; longer than 24 inches gets unwieldy on tight sections.
- Long-handled loppers — for thick, woody branches inside the hedge that a trimmer can't get cleanly. Cutting those with trimmer blades leaves ragged wounds.
- A taut string line — the most important tool on this list and the one nobody uses. Stretch it between two stakes at your finished height before you start. Without it, you're eyeballing a straight cut at arm's length from a ladder. The string shows you where straight is.
- Light oil and a clean cloth — wipe and oil the blades before you start and when you're done. Sap gums blades fast. Sharp blades cut cleaner and put less stress on the plant.
Avoid cordless trimmers with weak batteries on a large hedge — stopping every 15 minutes to recharge breaks your rhythm and your cut line. Get the runtime you actually need before you start.
When to trim a hedge in Surrey
Timing depends on species. That's not a dodge — it's the single most useful thing anyone can tell you.
Flowering hedges (forsythia, weigela, flowering quince): trim right after bloom finishes. Cut before the bloom and you'll remove the flower buds you spent the winter waiting for.
Formal evergreen hedges (cedar, boxwood, English laurel, Leyland cypress): late May to June is the main window, once new growth has hardened off. A light tidy in August is optional. Avoid fall trimming — freshly cut tissue is frost-sensitive, and Surrey gets cold snaps earlier than most people plan for.
Conifer hedges: late spring only. Conifers don't regenerate from old wood the way broadleaf plants do. Cut at the wrong time and you'll be managing brown patches for a season or more.
One thing most Surrey homeowners don't know: before you trim May through August, check the hedge for active bird nests. BC's Wildlife Act protects active nests. A quick visual inspection takes 60 seconds. If there's a nest with eggs or chicks inside, leave the hedge alone until they've fledged.
How to trim a hedge the right way
Step by step — this method works regardless of species:
1. Set the guide string first. Non-negotiable. Stretch a string between two stakes at the finished height you want. This is your reference. Trust it more than your eye at close range.
2. Start at the bottom, work upward. Cut in horizontal passes moving up the face. Cuttings fall away from your work zone instead of into it. You're not fighting debris on the way up.
3. Cut at a slight batter. Rule of thumb: for every foot of height, the base should be about 1–2 inches wider than the top. This isn't decorative — it lets light reach the lower growth. Hedges that are wider at the top than the base go bare at the bottom within a few years.
4. Step back every minute. From 18 inches away, you cannot see the shape you're making. Step back to 6–8 feet every minute or so. What looks straight from close up usually isn't.
5. Follow the string for the top pass. Save the top for last. It'll look cleanest when you haven't disturbed the sight line cutting everything else.
The one thing that kills hedges: cutting into old wood with no green on it. Green growth regenerates. Woody, brown stems without any green attached generally don't — especially on conifers. If your trimmer is hitting bare wood, you've gone too far. Stop and let the remaining green fill in before cutting further.
What to do with an overgrown hedge
The right approach depends entirely on species.
Some hedges — cedar, English laurel, Portuguese laurel — can handle an aggressive cut every few years and recover well. Others — Leyland cypress, most true conifers — cannot regenerate from old wood. Cut past the green zone on those and you're left with dead sticks. Permanently.
The safe approach for most overgrown hedges is to spread the work over three seasons:
- Year one: Cut one side hard, leave the other.
- Year two: Cut the other side hard.
- Year three: Address height.
This spreads the stress over three seasons instead of one. The hedge doesn't go into shock. You keep the green you need on the uncut face while the cut side fills back in.
I reckon this three-year approach prevents more hedge losses in Surrey than any other single piece of advice. It's slower. It works.
I've seen what happens when the shortcut gets taken. A homeowner in Surrey hired a landscaping crew who cut all four faces of a 14-foot Leyland cypress screen hard in a single day — all sides, down to the brown. Two years later it was brown sticks on three faces. The fourth face, which happened to have slightly more shade, was struggling but holding. Full removal the following autumn came to $2,200. The hedge cost $400 to install eight years earlier.
For a deeper look at what works (and what doesn't) with conifer hedges, our guide to pruning cypress trees covers the specific dos and don'ts in more detail.
Cedar and Leyland cypress: Surrey's most common problem hedges
Most hedge guides don't mention species at all. That's a problem if you're in Surrey — because the two most common hedge species here behave completely differently under the same clippers.
Western red cedar:
- Tolerates trimming well
- Regenerates from green wood reliably
- Can handle a meaningful reduction as long as green growth remains on the cut face
- Best times: late May–June and a light tidy in August
- Long-lived and adapted to Surrey's wet winters — a better long-term choice than most alternatives
Leyland cypress:
- Does not regenerate from old wood — ever
- Cut to the brown and it stays brown
- Fast-growing when young, but once it exceeds 12–14 feet and the interior goes woody, your options narrow considerably
- Needs trimming two to three times a year to stay manageable — that's a bigger maintenance commitment than most people realise at planting time
I reckon Leyland cypress is the single most overplanted hedge species in Surrey. It's cheap, it grows fast, and in 10 years it's either a maintenance burden or a removal job. Native western red cedar takes longer to establish — but it lasts decades longer and tolerates our climate without the drama.
English laurel:
Very forgiving and can take hard cuts well. The caveat is that it spreads aggressively when neglected and can become a significant removal job if left alone for several years. Check for bird nests May through August before cutting — laurel is a popular nesting habitat and you don't want to find that out mid-trim.
When not to trim a hedge
These are the situations where not trimming is the better call:
- During active bird nesting (May–August): Disturbing an active nest is an offence under BC's Wildlife Act. Look before you cut. If the hedge is in use, wait until the chicks have fledged.
- In fall: Fall trimming stimulates new growth that enters winter without time to harden off. That growth usually dies back, creating work in spring. Trim in late May or June. Whatever you miss can wait until next year.
- During drought stress: A hedge working hard to manage its water budget doesn't need the added stress of a major trim. Wait until conditions ease or rain arrives.
- When the hedge is diseased: Trimming with contaminated tools spreads fungal and bacterial infections through the cut wounds. Address the disease first, then trim with cleaned and disinfected blades.
- Immediately before a hard frost: Same logic as fall trimming. Fresh wounds and freezing temperatures are a combination that causes dieback.
When to stop doing it yourself
Honestly, most residential hedges in Surrey are manageable for a capable homeowner with decent tools and a few free hours. That's not me talking myself out of work — that's just the truth. The jobs that go wrong aren't usually complex. They're the ones where someone reached a bit too high on a ladder, or cut a Leyland cypress back further than they should have, or couldn't see the shape they were making.
Call a certified arborist when the job becomes something your tools and footing can't handle safely:
- The hedge is over 12 feet tall and ladder work near a fence or structure is involved
- It's Leyland cypress that's gone woody — you need an honest read before cutting causes permanent damage
- There are power lines within falling distance of the hedge
- You've already cut it back hard and it's not recovering — that needs a different approach, not more cutting
- The hedge is on a property line and there's disagreement about what's appropriate
For a standard residential hedge trim in Surrey, expect $300–$800 depending on size, length, and access. That number includes cleanup — no homeowner should be picking up trimmings after us. For a full look at what our tree and shrub services cover, the services page has the detail.