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I dispute your statement that Ivy...'will not constrict' trunks or branches. I sawed through an Ivy stem at its base - it was a 4.5 ins diameter stem whih was growing up a 50-60 ft Oak Tree - and
simultaneously when I'd finished cutting-through the stem , - the stem on the upper side of the cut sprung away for about 2 ins. One could not push it back in situ, even with great pressure. Therefore the stem had grown & created tension,by itself.
Another name for this tension would be
When one removes Ivy that has been growing
around branches for a considerable time -
one can often see the actual indentations/
impressions marked upon the surface of those branches - in the same way as one
sees similar ones following the removal of
a Tree-Tie c/w stake after the establishment
of a young tree. We all know that where
such operations have been neglected, that
growth of the tree is curtailed,because there is a check on the trees physical growth systems. Ivy must check these sytems in the same hysical way.
beleive that

A downside characteristic of ivy on trees is the prospect of the bulk eventually making the tree unstable.

Ivy being Evergreen growing on deciduous trees makes the trees highly likely to be blown over in gale force winds, some evidence of this can be seen in many woods up and down the land, hence why the Ivy is often cut especially along roads and other highways.

In my job, I have been delivering heating fuel to the rural parts of 11 midlands counties, for 12 hours a day, and for 32 years. I have traveled along literally thousands of lanes, to hundreds of villages (I have the evidence to support this) and I say without reservation that Ivy is detrimental to healthy trees. Every year, in the storms and high winds of the late Autumn, the vast majority of trees, including the healthy looking ones I see fallen, are the ones covered from bottom to top with Ivy. During the Summer, the odd fallen one, is Ivy covered. Other drivers are aware and in agreement with this, and fear for the future of our country lanes. Any single chance I get, the saw, and the secateurs come out, goodbye Ivy, and our woodland heritage gets a breathing space.
We need an "Ivy League", to save our Trees, we have "Guerilla Gardners", it's the trees that need our help now.

Ivy is not good for trees. Specimen trees should always be kept clear of it. Dying trees near roads or in parks frequented by people should be cleared of Ivy and stablised or cut down. However it would be impracticable to remove all Ivy from all trees, especially in a unfrequented woodland, and any Wildlife Trust would argue that ivy is a vital part of the wildlife hierarchy. Home to bugs which in turn are food for birds nesting in the ivy.

Thank goodness there are some sensible comments about the destructive nature of ivy. Yes it is a nectar source for wildlife, so let's allow it to strangle blossom on trees.

The ivy doesn't hurt trees brigade are loonies.

WRONG!! According to this source referenced below, ivy does in fact kill trees & explians how. Unfortunately, I found this too late, as my beautiful old oak tree is damaged to the point of having to be cutl down.

The real downside of ivy is it can just simply take over the tree in time slowly killing the tree and in affect making it week and could fall, if ivy maintained correctly it really can transform your garden in a good way, left to its own devices it can soon over whelm all plants and ground in your garden

English Ivy is not native to North America, and there are no checks and balances in the North American ecosystems to prevent it from doing harm. I suspect a lot of the differences of opinion we get are caused by different experience in Europe where it has been around for a long time and native species can handle it better.

Thanks for this write up. In support of some of the comments below. Ivy is often recommended to be removed in order to protect specific trees in times of storm and high winds.

This is becoming a more regular task for tree surgeons

Slightly differ t point but my neighbours ivy ground and tree cover has taken over our boundary fence to the point of being beyond remedy. Just have to keep trimming back to stop the invasion.

Interesting thread. Here in England there is much greater ivy infestation than used to be the case. Roadside trees are festooned with great hawsers of ivy, making them top-heavy, and subject to sail effect in high winds. Inevitably, any question of pruning or ivy removal is pounced upon by the 'nature must have its way' brigade. The result is that stately oaks that have been around since colonial America, are loosing their shape and are having to stretch for light as the invasive ivy branches out into a lightproof canopy. Small trees succumb very swiftly because they don't have the huge root structure to counteract the increased wind pressures. It's all rather sad.

Hi, thank you all for your input. I think we should prioritise here and look at the wider picture. Having recently rewatched Al Gore's very inspiring 'Inconvenient Truth', the big issue affecting man (and woman) kind at the moment is the escalating increase in carbon dioxide emissions. So, to me it's a simple choice of protecting as many trees as possible, to absorb as much CO2 as possible, so the ivy has to go. It's not exactly a rare species and I'm afraid the argument for bird habitat has to come in seconnd place. Otherwise it's curtains for us!

Ivy has been described as having both positive and negative effects on the growth of trees. But I agree that something that hinders the growth of something then it is not good though it has other benefits like food for the birds.

I travel much around Lancashire and South Lakeland and have noticed how thousands of our native trees are being overcome by ivy ,so many are dying due to the density of the ivy not allowing sunlight to reach any budding leaves

All the trees near me are dying from ivy infestation. The damage to the trunks i have seen with my own eyes. They have rotted the bark and they are dying.

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