The park, covering an area of 8 hectares, was entirely planted by Guillaume Mallet in a valley oriented towards the sea. While the architectural ensemble of Le Bois des Moutiers is rightly considered a masterpiece, the park is no less a unique work of art due to the talent of Guillaume Mallet and 40 years of intense labour.
The acidic nature of the soil, exceptional in the Pays de Caux, allowed the introduction of many rare species, in stark contrast to the local vegetation (Chinese azaleas, eucryphias from Chile, Japanese maples, magnolias, rhododendrons from the Himalayas…).