1 Severe weather conditions
Thunderstorms and microbursts may cause trees to uproot and fall due to damp soil. According to a ST report, four people died and 62 were injured over the past 10 years by falling trees and branches.
2 Old age
Aged trees are weaker and are more prone to falling. NParks does regular inspections on trees to prevent them falling and cuts trees that show signs of weakness.
3 Root failure from rot
In June this year, one of Singapore Botanic Gardens's heritage trees fell due to root failure from rot at its base. The 91-year-old tree was the last of the second generation of rubber trees.
4 Poor maintenance
Trees have to be properly taken care of to prevent them from getting weak or dying. Lack of care and water as well as the invasion of pests and weeds to trees' planting beds may cause the tree to be more prone to falling.
5 Shallow roots
Some trees have roots that are only four inches deep into the soil. This may cause them to be unstable years into their lives. For example, the Albizia, a tree type vulnerable to rot and pests, is more prone to falling due to its brittle wood structure and shallow root system. The authorities are looking into removing them.
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