The insta-redwood tree that was created in the pilot episode will survive and release seeds, which will get stuck to the surface of any passing ships with conifer sap. Some of those seeds will be carried by a ship that investigates a torus-shaped field of breathable gases, and will sprout into new redwoods, which will grow needles on both ends to take advantage of greater photosynthetic opportunities in zero-G. Happy Arbor Day indeed, Ed: you've just planted the first Integral Tree