Room to grow
Our arborists check whether trees are able to grow properly. We assess whether the tree is healthy and has enough space to grow. We may need to prune a tree, or the site may require additional fertiliser or aeration. In some cases, felling is unavoidable.
Management of trees in public parks
The aim of work carried out on trees in woodland areas is to make them more diverse and future-proof. A uniform woodland area – whether in terms of species or age – is more vulnerable to disease and is of less value to plants and animals. It may therefore be necessary to allow certain trees to die by ‘girdling’ them, pruning them back to the trunk, or even felling the tree. We do this to give plants, shrubs and other trees the chance to grow.
Dead wood, new life
In places where it is appropriate to do so, such as in woodland parks, we increasingly leave dead branches on the ground or dead trees standing. We do this because old and dead wood is extremely valuable in nature. It provides a habitat for a wide variety of life, from rare fungi to bats and from beetles to lichens. So, if you see a dead tree lying in the woods or a park, there’s a good chance that our ecological managers have left it there on purpose.
Further information on dead wood.
Tree felling and new planting
To ensure we have enough healthy trees in our municipality, we need to replace and replant a number of trees every year. Sometimes this is necessary because a tree is too old or diseased. Sometimes it is also unavoidable that a tree has to make way for something else, such as a road, a building or even another tree. Where possible, we replant one tree for every tree that is felled. We sometimes do this in the same spot, and sometimes elsewhere.
When planting new trees, we naturally take great care to improve the growing conditions, so that the right tree is planted in the right place. A tree needs just as much space underground as it does above ground. This means that we sometimes replant fewer trees, but the trees we do plant are given a good, more spacious growing environment. This allows them to grow to a healthy size.
Pruning trees
The council often receives requests to prune trees. We usually prune a tree once every 3 to 5 years, unless, for example, the tree poses an immediate danger to the surrounding area. Our tree inspector regularly inspects trees in public spaces and determines whether pruning is necessary. You can find more information about when we do and do not prune trees on the page on pruning trees.
Trees in property development
For example, when houses are being built or a street is being redesigned, this can have an impact on existing trees. With this sort of spatial development, it is important to carefully assess whether the existing trees can be incorporated into the plan. It is also important, whilst the work is being carried out, to ensure that the trees we wish to preserve are not damaged – both above and below ground.
Replacement of landmark trees
Sometimes trees define the character of a street. The local council is gradually replacing trees that define the character of a street. Think of neighbourhoods with lots of large, old trees. When replacing trees, we will, more often than in the past, plant a mix of different species and ages. We do this, for example, to prevent diseases or pests from spreading from tree to tree. Think of the oak processionary caterpillar. By planting different species of trees, we are investing in extending the lifespan of trees and in biodiversity.
Nutrition and fertilisation
Trees need nourishment. This nourishment consists of sunlight and CO₂ from the air, supplemented by oxygen, water, minerals and nutrients from the soil. Nature has a good system for this. Leaving fallen leaves on the ground ensures that, once the leaves have decomposed, the tree can reabsorb the nutrients. Where this is not possible – for example, for road safety reasons – it is sometimes necessary to provide trees with additional nutrients, such as lime or tree fertiliser.
Tree bunkers
In the city, underground space is limited, due to things such as sewers, cables and pipes. In such cases, we create space by planting the tree in what is known as an underground ‘tree bunker’. It’s a sort of large flowerpot buried underground. This way, the tree and its surroundings do not interfere with one another. In this way, Apeldoorn retains its green character.
Oak processionary caterpillar
The oak processionary caterpillar is the caterpillar of a moth. People and animals can be severely affected by the oak processionary caterpillar in summer. In addition to their normal white hairs, these creatures also develop stinging hairs. Contact with these can cause itching, a rash and irritation to the eyes or airways. We are doing a great deal to prevent the caterpillars from developing. We are trying to attract the caterpillar’s natural predators, such as birds and certain species of wasp. However, we cannot prevent everything. Have you spotted a nest of oak processionary caterpillars? You can report the location to the local council. We will then remove them from the tree. Further information can be found on the page ‘Nuisance and hazards caused by animals’