Victor Amadeus III of Sardinia
Between 1730 and 1731 the garden was laid out in a geometric plan of flowerbeds within the Castello del Valentino's existing garden area (approximate 6800 m2), within which Caccia planted about 800 species. By 1762 some 1200 species were in cultivation. In 1796 Victor Amadeus III of Sardinia donated areas west and north of the castello, bringing the garden's area to somewhat larger than its current extent. By 1810 the garden contained about 6000 cultivated plants, with an arboretum organized on its northern section (the boschetto), and the constructions of greenhouses, orangery, and herbarium. Between 1831 and 1839 further construction added more greenhouses, and in 1848 a substantial orangery.