Component of the dammarane-type triterpene saponins (e.g. PPD-type ginsenosides or panaxosides) biosynthetic pathway (PubMed:25320211, PubMed:27746309, PubMed:29378087, PubMed:25769286). Glycosyltransferase that catalyzes the conversion of ginsenoside Rh2 to ginsenoside Rg3 (PubMed:25320211, PubMed:27746309, PubMed:25769286). Triggers the biosynthesis of ginsenoside Rd from ginsenoside F2 (PubMed:25320211). (20S)-ginsenoside F2 + UDP-alpha-D-glucose = (20S)-ginsenoside Rd + H(+) + UDP (20S)-ginsenoside Rh2 + UDP-alpha-D-glucose = (20S)-ginsenoside Rg3 + H(+) + UDP kcat is 8.6 sec(-1) with ginsenoside Rh2 as substrate (at pH 7 and 35 degrees Celsius). kcat is 0.41 sec(-1) with ginsenoside F2 as substrate (at pH 7 and 35 degrees Celsius) (PubMed:25320211). kcat is 1111 sec(-1) with ginsenoside Rh2 as substrate (at pH 8 and 40 degrees Celsius) (PubMed:25769286). Secondary metabolite biosynthesis; terpenoid biosynthesis. Expressed at higher levels in roots than in leaves. Induced by methyl jasmonate (MeJA) in roots and leaves (PubMed:25320211). Induced by A.niger mycelium-derived elicitor, thus improving ginsenosides production in adventitious roots culture (PubMed:27746309). Belongs to the UDP-glycosyltransferase family.