2021 – Miyawaki Planting in Cergy Wood – #1

Before planting
2 years later

Période de plantation : février 2021


The association’s first plantation in the Val d’Oise, the Cergy experiment was carried out in a small clearing in the Bois de Cergy, in order to observe how a dense plantation using the Miyawaki method can be integrated into an existing wood and contribute to its regeneration. The participation of local residents and the people of Cergy made this pilot project very interesting from the outset.

This project is the fruit of an unprecedented collaboration between the Boomforest association, the CommunautĂ© d’AgglomĂ©ration de Cergy-Pontoise, and an external financier, the CenergY company, part of the Coriance group, which manages the urban heating network of the CommunautĂ© d’AgglomĂ©ration and which wished to continue its energy transition action by contributing to actions in favor of biodiversity in the conurbation in which it is located.

Planting location: Bois de Cergy, Cergy-Pontoise (95)

The plantation is located in the Bois de Cergy, on a small path close to the Chemin des voies (to the south) and not far from the MaraĂźchers playground (where a second plantation was created in 2023). The plantation site is a small clearing where fallen trees (chablis) were leaving a gap in the forest canopy: it was decided to experiment with the extent to which the Miyawaki method could accelerate forest regeneration in this location, while attempting to bring in a greater diversity of local species (the wood comes from plantations with species selected primarily for their growth speed, such as locust trees, rather than for their integration with the natural vegetation of the site, which can present problems of sustainability).

For this experiment, it was decided not to modify the state of the soil prior to planting, and to rely on existing forest litter.
existing forest litter. This is a departure from the classic Miyawaki protocol, in which tillage is a fundamental step in the planting process. This may be due to the soil problem (the soil, although made up of forest litter, retains a strong sandy component due to the artificial origin of the wood), but also to the much lower luminosity in this small clearing than on an open site. A second site was planted in 2023 a few hundred meters away, on more open ground, to try and understand whether it was the luminosity or the soil that explained this slower growth.

GPS coordinates : 49.02400,2.07709

The planting in pictures

Before planting: preparing plants and soil

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Planting in February 2021

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Site evolution over time

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