What is tree pollarding?

Street tree pollarding is a pruning technique that involves the removal of the upper branches of a tree, usually to a specific point or "pollard head."

This method has been practiced for centuries and is commonly used in urban areas to manage the growth and shape of trees.

Here is some information about street tree pollarding:

Process: Pollarding is typically performed during the dormant season when the tree is not actively growing. The upper branches of the tree are pruned back to stubs, leaving only a framework of branches. This severe pruning stimulates the growth of new shoots from the pollard head.

Pollard Heads: The pollard head is the point to which the branches are cut back. It is typically located several feet above the ground or at a predetermined height depending on the desired outcome.

The pollard head is usually chosen to ensure that the regrowth does not interfere with nearby infrastructure or impede pedestrian and vehicular movement.

Regrowth: After pollarding, the tree responds by producing numerous new shoots from the pollard head. These shoots grow rapidly and can form a dense, bushy canopy.

Regular pollarding cycles are necessary to control the regrowth and maintain the desired size and shape of the tree.

Species Selection: Not all tree species are suitable for pollarding. Typically, species with vigorous regrowth and tolerance to heavy pruning are chosen for street tree pollarding.

Commonly pollarded tree species include London plane (Platanus spp.), willow (Salix spp.), and some species of poplar (Populus spp.).

Benefits: Pollarding street trees offers several advantages. It helps manage the size of trees, ensuring they do not obstruct infrastructure or interfere with overhead utility lines. It also reduces the risk of falling branches, enhancing public safety. Pollarding can extend the lifespan of trees by promoting new growth and rejuvenating older specimens.

Additionally, it can create a formal and aesthetically pleasing appearance in urban landscapes.

Maintenance: Pollarded street trees require regular maintenance to control regrowth. Pollarding cycles can vary depending on the tree species and local conditions but are typically done every few years.

During maintenance, the new shoots are pruned back to the pollard heads to maintain the desired form.

Considerations: Proper pollarding requires skilled arborists or tree care professionals who understand the technique and its impact on tree health. The timing, frequency, and extent of pollarding should be carefully planned to avoid excessive stress on the tree and ensure its long-term vitality.

It is essential to follow local regulations and guidelines regarding tree pruning and maintenance.

Street tree pollarding is a management practice that balances the needs of urban environments with the health and longevity of trees.

When done correctly and with consideration for the specific tree species and local conditions, pollarding can be an effective way to maintain attractive and functional street trees.

It's important to note that not all tree species are suitable for pollarding, and the practice should be carried out by trained professionals following proper guidelines and timing to ensure the long-term health and vitality of the trees.

Additionally, the decision to pollard street trees should be based on a careful assessment of local conditions, tree species, and the specific goals of urban planning and management.