Seville City Hall Inspects 12,000 Trees to Prevent Heat-Related Branch Drops

The Seville City Council has launched a summer inspection campaign covering 12,000 trees in parks and plazas to prevent sudden branch falls caused by heat stress. Already 3,015 specimens have been checked since May 18.

The Seville City Hall has begun a massive inspection of 12,000 trees across the city as part of a summer safety program to reduce the risk of falling branches due to high temperatures. The initiative, which started on May 18 and runs until August 31, focuses on areas with heavy foot traffic, including playgrounds, pedestrian paths, and major squares. Arbonists have already examined 3,015 specimens, identifying structural weaknesses caused by heat stress and water deficit.

Summer Branch Drop, a phenomenon marked by the sudden collapse of apparently healthy limbs, has become a growing concern in Seville. Municipal data show that about half of all branch-related incidents now occur during the summer, compared with isolated cases in the past. “The safety of citizens and the preservation of our tree heritage are two priorities that must go hand in hand,” said the delegate for Trees, Parks and Gardens. She stressed that the inspections allow the city to “act in a preventive and planned manner where potential risk is highest.”

The program prioritizes large trees and palms, especially those near play areas, densely used streets, or classified as dying. Special attention is given to species most vulnerable to heat, such as ficus, eucalyptus, and certain palm varieties. In 2024, over 200 branch falls were recorded, causing minor injuries and property damage. This year, the council has allocated €1.2 million to the inspection campaign to avert further incidents.

“The main triggers are heat stress and water deficit,” explained a municipal arborist. “When trees lack moisture, they close their stomata, leading to pressure buildup inside the branches. This can cause sudden fractures.” The inspections involve visual checks and, when needed, resistograph tests to detect internal decay. If a tree is deemed hazardous, immediate action is taken: pruning, crown reduction, or removal.

Seville relies heavily on its urban trees to combat the urban heat island effect, but the same heat that makes them valuable also stresses them. The council’s long-term strategy includes improved irrigation and species diversification. Residents are encouraged to report suspicious branches via the 010 hotline or the city app. The city expects to finish the inspections by the end of August, just before autumn sets in.