Since it has "the ability to plant itself in the most severe environments", I'd say underground is a worthy addition to the environment line.
EDIT: Also, we need to fill in a few x's...
A mature plant consists of a main vine, about x feet long. Smaller vines up to x feet long branch off of the main vine about every 6 inches. These small vines bear clusters of leaves which sprout crimson blossoms in the spring and bear bloated, blood-red fruits the size of cherries in the late summer.