Extraterrestrial plants
Extraterrestrial plants are non-animal photosynthetic or chemosynthetic organisms described by secret space program witnesses as existing on other worlds, in terraformed domes, and in underground habitats off Earth. Accounts emphasize that plant life on planets orbiting different spectral classes of stars would display radically different coloration and morphology from Earth vegetation. For terrestrial plants of claimed non-terrestrial origin (including psychoactive plants posited as NHI-seeded contact technology), see Exotic plants.
Mars vegetation
Andy Basiago, claiming to have visited Mars via Project Pegasus jump-room technology in the early 1980s, describes the Martian surface as sparsely vegetated, with most plant life concentrated in low-lying areas. Surface vegetation observed included small grasses and filamentous sedges.
Basiago additionally references a National Geographic article, possibly from 1958, showing a green region on Mars approximately the size of Texas — evidence he cites as proving the existence of macroscopic Martian vegetation that was subsequently suppressed. Trees are also described in Basiago's and Richard Hoagland's analyses of NASA Mars images.
The glass tube structures documented by Hoagland and others from NASA imagery are interpreted by Basiago as possibly biological in nature — large hollow organic structures supporting plant or animal communities within them.
Underground Mars vegetation
The Martian cave system is described by multiple witnesses as more richly vegetated than the surface, sheltered from radiation and wind erosion. Basiago notes that during a surface excursion with Bernard Mendez and Barack Obama (then "Barry Soetoro"), digging six to eight feet underground revealed a metallic layer in some areas — but in others, Martian humanoids had created vegetated underground layers.
Terraformed domes
The Interplanetary Corporate Conglomerate is described as having established terraformed agricultural domes on Mars — sealed environments with introduced Earth plant species maintained under pressurized conditions to support the slave-labor workforce. Similar dome habitats are described on the Moon and on Ceres.
Other worlds
Elena Danaan's descriptions of Taygetan and other extraterrestrial homeworlds include extensive botanical diversity. Erra — the Ahel colony in the Taygeta system — is described as a planet with "luxuriant forests, deep valleys, notable coastlines and numerous high mountain ranges," populated with vegetal and animal species imported from the ancestral homeworld Maya when the Ahel terraformed it, sustaining five distinct climate zones. The Ahel's vegetal-only diet — they "have a vegetal alimentation" and avoid consuming "blood life-forms" on the principle that ingesting them lowers vibrational frequency — implies sophisticated botanical agriculture capable of providing complete nutrition across long space voyages.
SunBôw's Sasquatch teachings identify plant life as the first macroscopic life form introduced by star-faring peoples to developing planets, preceding animal introduction as part of a staged terraforming sequence.
The Exopolitics Today episode on 13 years aboard a Dark Fleet vessel includes discussion of off-world plant life encountered during that service.