During the winter of 2024-2025, 391 trees were planted by the Sevewhile 215 trees were slaughtered during the previous year.
This last planting season carried out under the old legislature is taking stock of 2,900 new trees in the cityalmost 4 times more than before, against around 1,050 trees that had to be killed (health, safety or bad weather).
The unprecedented and ambitious objective to replant three trees for each slaughtered specimen was made to satisfaction. The Seve managed to hold this ratio for four years; Only that of the last season could not be fully reached.
Indeed, with the massive acceleration of planting, the green spaces have been strongly requested and the areas available, already few beforehand, are dried up. “Despite a limited, dense and ultra -sought -after territory, the Seve will continue to do everything to find available plots and develop new projects in order to increase the canopy rate and reduce heat islands. For this, the effort will now have to focus on roads,” notes Alfonso Gomez, mayor.
Diversity of essences and places
Last winter, 20% of the trees were planted in the streets (Gasometer, Grand-Pré, Miremont, several Pâquis sites, etc.) and 65% in parks. THE 15 % remaining is located in schools, sports centers and private plots of the city. In total, 121 species and varieties of trees, including many oaks, maple and pines, were planted.
Regular heat waves and other prolonged droughts directly influence the choice of essences. Moreover, This great variety, more than half of which is native, contributes to The enrichment of biodiversity And helps prevent vagaries linked to pathologies or stresses felt by certain trees, often in connection with climate change.
Reinforced trees
THE Consequences on the wooded heritage of climate change already being clearly felt, the care given to trees will be the subject of still increased attention in the future. With regard to young trees, the seve teams are working on their maintenance daily – Watering, maintenance of bowls at the feet of the trees allowing to retain water, control of tutors, etc. While previously this follow -up was mainly ran over the first three years following the plantation, the deadline has already had to be extended at five years.
With regard to older wooded heritage, care measures to preserve its longevity are reinforced. Thus, shrouds (support cables) are regularly installed to secure branches with defects likely to cause falls, like several beech trees in the Parc des Eaux-Vives.
Protective perimeters under the crown of fragile trees can also be installed to guarantee safety while allowing trees to continue to provide their ecosystem benefits, as for the magnificent centenary cedar of the chirping crèche. In addition, different processes (amendments based on fungi, mulch, etc.) allow, at the feet of trees, to feed the soil, to improve its structure and to stimulate the root exchanges between neighboring trees.
Abandonment of size: spectacular results
Finally, the development of canopy in urban areas is also materialized by other actions than planting trees. In this regard, the first results of the gradual abandonment of the size of the cats at the head of a cat, Especially at rue Dancet and rue Hoffmann, are spectacular.
As a reminder, the Seve has changed its way of intervening on trees cut according to this traditional method in order to promote the development of foliage and increase shade that they offer in summer. The conversion phase requires careful support for each of the trees, over several years, especially to relearn them to carry their branches.
To date, on the 1,400 specimens concerned, nearly 500 trees have a state of health good enough to be candidates for conversion. As for how to cut plants to allow cohabitation between trees and buildings, TPG lines, and other road signals, it evolves towards an even softer practice.
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