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This one is worth getting right, because the common advice — always take it off — is wrong often enough to be worth correcting, and the opposite advice is wrong too.
What Ivy Is Not Doing
- It is not a parasite. Ivy has its own roots in the ground and makes its own food. It takes nothing from the tree
- It does not strangle the trunk. Ivy climbs with adhesive rootlets, it does not twine or constrict. That is a different group of plants entirely
- It does not bore into the bark of a healthy tree
- It did not kill a dead tree it is growing on. This is the commonest misreading — ivy thrives on a dying tree because the thinning crown lets light in. It is a symptom, not a cause
What Ivy Genuinely Does
Competes, once it is in the crown
While ivy is on the trunk it is not competing for light with anything. Once it gets up into the crown and spreads across the branches, it is directly shading the tree's own foliage, and on a tree already struggling that matters.
Adds wind loading
This is the most substantial practical effect. An evergreen mass in a crown that would otherwise be bare in winter is a large sail exactly when the gales arrive. On an exposed tree, or one with any structural doubt about it, that is a real consideration.
Adds weight
Particularly on individual limbs, and particularly when wet or snow-laden.
Hides everything
The practical one for anybody assessing a tree. Ivy on a trunk conceals cavities, fungal brackets, cracks and the root flare — which is to say, all the things you would want to look at. A tree that cannot be inspected cannot be pronounced sound.
When to Take It Off
- It has reached the crown and is spreading through the branches
- The tree is in a wind-exposed position
- The tree is showing signs of decline, and the ivy is now competing
- The trunk needs inspecting, for a survey, a sale or a genuine concern
- The tree is close to a building, where added loading matters more
- It is a young tree — ivy will genuinely outcompete one
When to Leave It
- A large, vigorous, healthy mature tree with ivy confined to the trunk
- A tree in a sheltered position with no structural concerns
- A standing dead tree being kept deliberately as habitat — ivy on one of those is doing nothing but good
- Anywhere the wildlife value outweighs a marginal loading concern
How It Is Done
Ivy is not pulled out of a tree. It is severed at the base and a section of stem removed, then left. The ivy in the crown dies, browns, and drops out over the following months, which does far less damage to the bark than hauling live growth down.
Check for nests and roosts first. Established ivy on a mature tree is a known bat roosting feature, and all bats and their roosts are protected whether or not a bat is present at the time. It is also heavily used for nesting. Where either is suspected, the work stops and proper advice is taken.
Where ivy has been severed, clearing the dead material out of the crown afterwards is optional. On a garden tree people usually want it tidied; on a tree in a wilder corner, letting it fall in its own time is fine and costs nothing.
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If you are unsure whether ivy on your tree matters, send a photograph of the whole tree from a distance. How far up the ivy has gone is the whole question.
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