The Duke was highly interested in questions regarding landscape design and had considerable influence on the planning of the English Garden in Meiningen.
Like his model Franz Anhalt of Dessau he gave priority treatment to agricultural undertakings and therefore, in 1787 a dairy was annexed to the park (until 1836).
In 1798, the Duke also started laying out the landscape park at Altenstein, a project he pursued energetically until his early death in 1803.
He had professional assistance from the court gardener Carl Ludwig Buttmann and the court mason Johann Andreas Schaubach. For three generations the Buttmann family of court gardeners had a formative influence on the parks in Meiningen and their layout. The so-called Buttmann stone in the English Garden was erected as a lasting memorial to their work.