Council owned trees

Essential health and safety tree work - Canbury Gardens

Tree works are scheduled for Wednesday 17th and Thursday 18th March 2021 in Canbury Gardens. 
  • Reduce one horse chestnut tree by half to reduce the risk of stem and branch failure.
  • Reduce adjacent horse chestnut by a third to reduce the risk of stem and branch failure and to reduce risk of windsnap (following exposure).

The large horse chestnut with structural concerns had an aerial inspection on 23rd November 2020 by the council's qualified arboriculturalist to assess whether the tree could be retained at a smaller size, or whether the tree required removal.

Following the inspection, the tree can be retained by reducing its height by half. The work will enable the retention of the tree, as opposed to tree removal.

Horse chestnuts do not respond well to such reductions however, not reducing the horse chestnut and installing cable bracing is not an option due to the location and length of the decay in the stems, as well as the other historical defects throughout the tree. Failure is likely to occur and will result in loss of the entire tree.

The tree will be monitored following the work and further safety works may be required. Should the tree not respond well to the reduction further works may include it be reduced to a standing habitat pole for biodiversity.

The inspection showed that the decay in the central stem is extensive and extends from the trunk up 9m of the branch (above photos).

There is also a large branch over Kings Walk footpath with a significant amount of decay on the upper side of the branch which is not visible from ground level (left photo).

There are a number of co-dominant stems throughout the tree which are liable to split apart (above).

Co-dominant stems are two or more, generally upright, stems of roughly equal size and vigour competing with each other for dominance.

These stems are extremely prone to failure.

Large fungal brackets of Dryads saddle (Cerioporus squamosus) found at the base of the tree (left photo).

This fungi causes decay and dysfunction within the tree. The result is usually stem and branch failure.

Last Modified: 12/03/2021 14:42:46