I'm assuming that the Gilgamesh myth is fairly distinct from the Mesoamerican Fountain of Youth and the Hindu Soma, but are there any corroborating myths or other research into the details of the plant in Gilgamesh.?
The myth itself has the plant growing in or under- water, and so has obvious connections with the Lotuslotus. Was the lotus a possibility for the time and region of the story?