Шёнбрунн
Boos came from a gardening family that lived in the Grand Duchy of Baden, his father being head gardener in Rastatt, his son Joseph Boos (1794–1879) being an assistant gardener at the Schönbrunn Palace. Franz began his career in 1771 as a gardener to Prince Leopold of Dietrichstein in Seelowitz (Moravia). From 1774 to 1775 he worked at the famous gardens of Prince Johann I of Liechtenstein in Lednice (also in Moravia) then, in 1776, he became assistant gardener at the Imperial and Royal Court Gardens of Schönbrunn Palace in Vienna.