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The historic meadows at the Domaine National de Marly-le-Roi will be used as a donor to restore the meadow at the Biodiversity School in Boulogne-Billancourt.

As a continuation of the actions carried out to maintain, perpetuate and increase the ecological environments established since the delivery of the building in 2015, the objective of this new operation is to restore the rooftop meadow of the School of Biodiversity from the historic meadows of the Domaine National de Marly-le-Roi.

In 2020, the ecologist Aurélien Huguet gave the prescriptions on how to ensure that the project would continue in the future: "The spaces of this roof do not correspond to the horticultural model, nor to that of the roofs with spontaneous vegetation. This is a unique approach, resulting from ecological engineering, to which neither conventional maintenance nor non-interventionist choices correspond. These spaces have now begun a dynamic that must be supported and enriched in relation to the expectations of users. There are still actions, ways of doing things and follow-up protocols to be instituted in order to move forward."

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Mowing is carried out by hand, on a plot of grassland selected for the richness of the species it shelters.
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Meanwhile on the roofs of the school in Boulogne, the meadow is prepared to receive the hay from Marly.
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The soil in the receiving meadow is turned over and raked by hand.
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Using the technique of "direct grassing" or "green transfer", the school pupils then spread the hay brought back from Marly.
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Finally, the installation of a net prevents hay from flying away as well as protecting the seeds from pigeons.
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For more information :

An experiment in ecological restoration