Monoterpene synthase that catalyzes the formation of geraniol from geranyl diphosphate. (2E)-geranyl diphosphate + H2O = (2E)-geraniol + diphosphate Binds 3 Mn(2+) ions per subunit. kcat is 0.8 sec(-1) with geranyl diphosphate as substrate. Optimum pH is 8.5. Secondary metabolite biosynthesis; terpenoid biosynthesis. Homodimer. Expressed in the peltate glandular trichomes of the leaves. The Asp-Asp-Xaa-Xaa-Asp/Glu (DDXXD/E) motif is important for the catalytic activity, presumably through binding to Mg(2+). Exclusively observed in the geraniol chemotype of this organism. Belongs to the terpene synthase family. Tpsb subfamily.