Small Woodland Owners' Group

Ivy

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Ivy

Postby simoninberko » Tue Jan 07, 2014 4:10 pm

I have noticed that there is an increased incidence of trees with Ivy infestation within app 50 foot of a road track, such does not seem to occur adjacent to the canal tow-path. Anyone know of an explanation of this?
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Re: Ivy

Postby oldclaypaws » Tue Jan 07, 2014 5:13 pm

The word 'infestation' implies Ivy is a problem, which it isnt. It provides valuable habitat for numerous insects and bats, and the berries are good food for birds at a time of year that other food sources are scarce. Don't cut Ivy off. If you look at trees with lots of Ivy growing up them, they are usually half dead. This isnt because the Ivy has killed them, its the other way round- Ivy is able to grow better on dying trees because there is less leaf cover and more light for the Ivy to take advantage of. Ivy is not parasitic, it just uses the trees for support. Ash trees though have an open slender crown that lets in light and can be smothered by Ivy, so its an idea to restrict Ivy growth on this particular species as an otherwise healthy tree can be overwhelmed.

I suspect your observation of more ivy nearer the road is because the road is wider than the tow path and the Ivy has a better environment / more light to grow.

If you have an old dying tree the extra weight of ivy can bring weakened boughs down, but that's just part of nature, and the dead wood on the ground provides habitat and nutrients as it rots, and the opening in the canopy lets in light for regeneration below the fallen bough, all part of the cycle.
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Re: Ivy

Postby simoninberko » Tue Jan 07, 2014 5:33 pm

Well, I intended no implication of harm to the tree and I am aware that the current belief is that Ivy does no harm.

Thanks for the light hypothesis, not sure that really accounts for the phenomenon as incidence seems to occur up to 50 foot from road and though tow path is narrow it is adjacent to a canal, thus making an area of open space somewhat larger then many roads
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Re: Ivy

Postby oldclaypaws » Tue Jan 07, 2014 6:38 pm

Are they different tree species in the 2 locations?
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Re: Ivy

Postby simoninberko » Tue Jan 07, 2014 7:46 pm

As far as I am aware they are the same species and sub-species, though it is noticeable that Ivy seems less inclined to inhabit Hawthorn, though that may be more a factor of the length of tree life
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Re: Ivy

Postby Treeation » Tue Jan 07, 2014 11:13 pm

oldclaypaws wrote:The word 'infestation' implies Ivy is a problem, which it isnt. It provides valuable habitat for numerous insects and bats, and the berries are good food for birds at a time of year that other food sources are scarce. Don't cut Ivy off. If you look at trees with lots of Ivy growing up them, they are usually half dead. This isnt because the Ivy has killed them, its the other way round- Ivy is able to grow better on dying trees because there is less leaf cover and more light for the Ivy to take advantage of. Ivy is not parasitic, it just uses the trees for support. Ash trees though have an open slender crown that lets in light and can be smothered by Ivy, so its an idea to restrict Ivy growth on this particular species as an otherwise healthy tree can be overwhelmed.

I suspect your observation of more ivy nearer the road is because the road is wider than the tow path and the Ivy has a better environment / more light to grow.

If you have an old dying tree the extra weight of ivy can bring weakened boughs down, but that's just part of nature, and the dead wood on the ground provides habitat and nutrients as it rots, and the opening in the canopy lets in light for regeneration below the fallen bough, all part of the cycle.


Interesting views on ivy Oldclaypaws, I agree ivy has high conservation potential but I take a more cut throat approach to its management. I see a small amount of ivy as no real threat but the problem comes when ivy dominates a tree. I have seen many healthy trees suffer from ivy dominance. I have also seen ivy choke stems so much that they have deformed the outer 5cm of bark and sapwood.Heavy Ivy growth is also a nightmare for arborists and tree fellers to deal with adding time to felling operations. Greater weight and an increased sail factor of ivy means higher risk of wind throw as well as suppression of internal crown growth by blocking light to buds that encourages scraggly, leggy growth. This means more chance of losing trees. This a problem if we are trying to grow trees for timber, specimen or veteran trees or trees that are close to targets such as footpaths and buildings. By taking small steps ie managing ivy by ring barking at a manageable height we are increasing the chances of survival of our trees. This can be repeated every 5 - 10 years to allow some ivy to grow back but never letting it get out of hand.

Of course leaving a few selected stems to succumb to ivy is a good idea to increase diversity but unless objectives are solely non-intervention conservation I would strongly consider cutting it before it dominates.
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Re: Ivy

Postby simoninberko » Wed Jan 08, 2014 8:58 am

I have to say I agree, I have experienced a dying Ash tree revived by removing the Ivy growth
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Re: Ivy

Postby oldclaypaws » Wed Jan 08, 2014 11:03 am

I did mention the susceptibility of Ash and agree it doesnt handle Ivy well. The Ivy seems to reacte to it as if it were a dying tree, and Ash has thin branches that don't take weight well. I'll remove Ivy from my Ash. I've had a close look at my Ivy and it prefers old senior trees with a thinning canopy. Its not as strong on healthy trees with a good leaf structure. If Ivy was able to dominate and kill all healthy trees, there would be no trees !

I had a visit from a FC chap who spotted the fact a couple of Ivy boughs had been cut through by someone. "Was that you?", he accused. "No, I don't have a problem with Ivy, its part of the ecology", said I. "Good, you should leave it, its important for wildlife", said Mr FC.

Perhaps it depends if you have a wildlife or commercial timber view, I can appreciate these are different perspectives. A weaker tree approaching the end of its life cycle may appear to have its demise accelerated by Ivy, but no more than by the wind or fungi. Its part of nature and has a useful contribution to the overall ecosystem. It makes good logs!
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Re: Ivy

Postby oldclaypaws » Wed Jan 08, 2014 11:17 am

Further to the comments I just added, found this comprehensive article, which seems to concur with my own thoughts and observations. Please read; its authoritative, well researched and gives a full overview of this misunderstood plant (which I like).

IVY - FRIEND OR FOE
Andrew Cowan N.D.Arb.
First Published: 2000

The issue of ivy and trees is one of those matters where it is all down to personal opinion. To some, it is a pernicious weed that smothers the natural form of trees and on which constant war must be waged. To others, it is an essential part of the wildlife habitat, providing shelter and food for a diverse range of different organisms. In reality, it will all depend on where and under what circumstances the tree is growing. Context is the key word here, and what might be fine in the middle of woodland may not be so desirable in formal parkland or a residential front garden.

Ivy is very well adapted to living in woodland, which represents it’s natural habitat. It’s growth characteristics enable it to survive where light levels are low, on the ground and up trunks of trees whose dense foliage shade the woodland floor. Ivy’s attributes of shade tolerance and evergreen foliage have proved invaluable in our gardens, where it has been used for attractive evergreen coverings for north facing walls and to provide ground cover in dark corners. Although the common ivy Hedera helix appears the most frequent, a variety of cultivars and other species are available for horticultural use.

Hedera helix, is the only native British evergreen climbing shrub. It has a habit known as dimorphism, whereby two forms occur within the same species. The juvenile growth, with its characteristic lobed ‘ivy shaped’ leaves, is adapted to living in low light conditions and is found creeping along the ground or climbing up walls and tree; while as the plant matures, it can throw out bushy branches and flowering shoots with very different, elliptical leaves (lanceilate to ovate). This adult form will only develop where the light conditions allow, and it is mostly found on the climbing section of the plant, only rarely on the ground.

Ivy has a very bad reputation and it is commonly thought that it kills trees. Contrary to popular belief, ivy is not parasitic and does not directly affect the health of the trees it climbs. Unlike true parasitic plants, (such as mistletoe, whose roots tap directly into the resources of the host plant) ivy has its feeding roots anchored in the ground and simply uses the tree as a support to get to where it wants to go. The masses of tiny, hair-like roots sprouting from the under surface of the stems, are simply designed to provide support and allow the plant to climb. Although these roots provide almost immovable adhesion to the rough surfaces of tree trunks and walls, they are not used for feeding, and at worst only penetrate the outermost layer of bark on host trees.

It is primarily in terms of competition for natural resources that ivy affects the health of trees, particularly where light is concerned. If ivy has become established on a tree, it is more likely to be a sign of stress than a cause of it. A heavy infestation of ivy, particularly in the upper crown, is usually an indication that the tree is in a natural state of decline; most healthy crowns will let insufficient light through for the ivy to grow vigorously. Ash, Fraxinus excelsior, is an exception as the crown tends to be thin and open. This allows major infestations to occur, thereby restricting photosynthesis, but it is still unlikely that the life of a healthy tree will be shortened. In the case of a diseased or dying tree, where the it’s growth rate and vigour may be slow or in decline, the ivy’s more vigorous growth allow it to smother the tree. The bushy adult growth will then have a tendency to make the tree top heavy, making it more likely to fall, particularly during adverse weather conditions.

One of the most important aspects when contemplating the removal of ivy from a mature tree, is its enormous wildlife value. The dense mass of foliage and intertwining stems around the trunks of trees, provide shelter for birds to build their nests, and dark nooks and crannies where bats can roost through the day. In Autumn, ivy flowers are an important source of pollen and nectar for wasps, butterflies, bees and a hose of fly species. Over winter, ivy protects woodland soils from full snow cover and frost. This enables ground foraging birds such as blackbirds, robins, dunnocks and thrushes to continue feeding;. while a sheltered habitat is also provided for small mammals and insects.

The berries, which ripen in March / April, have a high fat content and, although poisonous in large quantities, they provide both native and migrant birds with an invaluable early energy resource. Woodpigeons, starlings, resident and migrant thrushes and newly arrived summer migrants such as blackcaps feed on them. Some species of invertebrate are known to feed on the foliage of ivy, and several species of beetle bore the mature stems, while spiders spin their webs to catch others that fly in to shelter.

It should rarely be considered necessary or appropriate to remove ivy from trees within a woodland setting, where it is an integral part of the native ecosystem. An experiment was carried out, from 1890-1942, where ivy was cut on half the trees in a wood, and left to its own devices on the rest. When the wood was felled in 1942 there appeared to be no difference in the height, average girth or cubic content of the trees. On the other hand, in parks and gardens where conditions have allowed it to grow unchecked, it can become quite a problem; choking the crowns of ornamental trees, swamping less vigorous shrubs and smothering walls and rockeries.

Although rarely a problem to the tree, a dense covering of ivy over the trunk and throughout the crown of a mature specimen can inhibit essential safety checks, by limiting a visual inspection of the trunk and main branches. Where mature trees are growing in residential gardens often close to dwellings or public open space, it is important to be able to complete regular hazard assessments and monitor the decay of old wounds. In such circumstances it becomes essential to remove the ivy.

From a practical viewpoint , the most effective way of removing ivy is to cut it near to the base of the tree. When doing this, it is necessary to remove a section of all the stems around the entire circumference of the tree’s trunk. Once cut from it’s roots the ivy growth, up the trunk and branches, can be left to die on the tree, and when sufficiently dry and brittle it can be removed. The best time to consider this work is over the winter when the host tree is likely to be bare of leaves, and visibility while completing the task is much improved. Very dense ivy can sometimes be used by bats to hibernate through the winter. To avoid unnecessary disturbance of hibernating bats it is best to cut the stems of ivy in the late summer or autumn, so the foliage dies before the winter months. The removal of ivy during the summer should be avoided where possible, because of it’s likely use by nesting birds and roosting bats.

It is an offence under the Wildlife and Countryside Act 1981 (as amended), to intentionally damage or destroy a wild bird’s nest, whether in use or under construction. The use of the ivy by bats for shelter and roosting must also be considered. A bats roost is protected both under the Wildlife and Countryside Act 1981 (as amended), and The Conservation (Natural Habitats etc.) Regulations 1994, which make it an offence to damage or destroy a breeding site or resting place of any bat, and it does not require the offence to be intentional or deliberate. Furthermore, under an amendment made within the Countryside and Rights of Way Act 2000, it became an offence to recklessly damage or destroy a bat roost, and it could be reckless not to consider possible use of ivy for roosting.
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Re: Ivy

Postby Steve Medlock » Wed Jan 08, 2014 5:30 pm

Creeping death.
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