Yes, you can remove ivy from trees without killing them — and doing so is one of the best things you can do for your tree's long-term health. The key is using the right method, working carefully, and being patient. Rushing or using the wrong approach can damage bark and leave your tree vulnerable to disease and pests.
Why Ivy Is a Problem for Trees
Ivy (Hedera species) is a vigorous climber that can cause serious harm to trees over time. While it doesn't technically parasitise the tree, it creates problems in several ways:
- Weight loading — Dense ivy growth adds significant weight to branches, increasing the risk of limb failure, especially in wind or after rain.
- Shading — Ivy smothers the tree's canopy, reducing photosynthesis and weakening the tree gradually.
- Moisture retention — Ivy holds moisture against the bark, encouraging fungal disease and rot.
- Hidden hazards — Ivy conceals structural defects, cavities, and decay that would otherwise be visible during inspection.
- Pest habitat — Thick ivy provides shelter for rodents and insects that can further damage the tree.
In New Zealand, common English ivy (Hedera helix) is also considered an environmental weed in many regions, spreading into native bush and smothering ground cover. Check with your local council or regional authority about any obligations you may have to control it on your property.
The Right Method: Cut and Leave
The safest and most effective technique for removing ivy from trees is the "cut and leave" method. This avoids tearing ivy away from the bark, which can strip protective tissue and cause injury.
Step 1 – Clear the base
Using secateurs or loppers, cut all ivy stems at the base of the tree, creating a clear band around the trunk about 30–50 cm wide. Cut each stem individually rather than pulling. For thick, woody stems, a pruning saw or handsaw works well.
Step 2 – Leave the ivy on the tree
Do not immediately pull the ivy off the trunk or branches. Leave the cut ivy in place. Over the coming weeks and months, it will die back and dry out, making it much easier to remove without damaging the bark.
Step 3 – Remove dead ivy later
Once the ivy has dried (typically after 4–8 weeks, depending on the season), you can gently peel it away from the bark. Work slowly and carefully — if it resists, leave it longer. Never force it.
Step 4 – Clear the root zone
Remove ivy from the ground around the base of the tree. This prevents regrowth climbing back up. You can dig out the root system or treat cut stems with an appropriate herbicide — follow the product label carefully and consider the proximity to the tree's roots.
Tools You'll Need
| Tool | Use |
|---|---|
| Secateurs | Cutting small stems at the base |
| Loppers | Thicker stems up to ~3 cm |
| Pruning saw | Woody, established stems |
| Gloves | Protection — ivy sap can irritate skin |
| Safety glasses | Debris and sap protection |
| Long sleeves | Ivy sap can cause skin reactions |
Ivy sap can cause skin and eye irritation in some people. Always wear gloves and wash your hands thoroughly after handling it. See WorkSafe NZ for general guidance on safe use of garden tools and chemicals.
Timing: When Is Best?
In New Zealand, late winter to early spring (August–October) is generally a good time to tackle ivy removal. The ivy is easier to see before new growth kicks in, and the tree is about to enter its active growing season, which helps it recover from any minor bark disturbance. Avoid working in very wet conditions, as wet bark is more easily damaged.
What to Avoid
- Don't pull ivy off a living tree — this risks stripping bark and cambium tissue.
- Don't use a weed eater or strimmer near the trunk — accidental bark damage (ring-barking) can kill a tree.
- Don't apply herbicide directly to the trunk — it can be absorbed through damaged bark.
- Don't climb the tree yourself — working at height in trees carries serious risk of injury.
Caring for the Tree Afterwards
Once ivy is removed, inspect the trunk and visible branches for signs of damage, decay, or disease. Look for soft spots, discolouration, fungal growth, or cavities. If you notice anything concerning, have the tree assessed by a qualified arborist. A healthy tree will generally recover well once the ivy burden is lifted, but stressed or older trees may need additional support.
For guidance on tree health and best practice, BRANZ and your local council's arboricultural team can be useful starting points.
When to Call a Professional
Some ivy removal jobs are best left to a qualified arborist:
- Large or mature trees where ivy has reached the upper canopy — working at height requires specialist equipment and training.
- Trees near power lines — this is potentially restricted work; contact your lines company before doing anything.
- Trees with suspected structural damage or decay — a professional can assess whether the tree is safe.
- Significant ivy infestations covering multiple large trees.
- Protected or notable trees — some trees in NZ are protected under district plans and may require council consent before any work is carried out. Always check with your local council first.
A qualified arborist (look for NZ Arboricultural Association members or ISA Certified Arborists) can remove ivy safely, assess tree health, and advise on ongoing management. You can find experienced local arborists on tradedirectory.co.nz.
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