This plant sprang up everywhere the Martians visited and soon strangled all native flora. It was prolific, it expanded for acres and acres covering the countryside. When it began to die back, green shoots of native plants quickly shown up where it died, and the trees that had been covered seemed to reawaken as though they had been dormant.
However, amongst the re-emerging native plants are some species that are not quite as they once were. Strange lonely trees now dominate an otherwise empty moor, a twisted shape with few leaves, roots that reach out for more than water and creak ominously as passers by.
The animals that feed on these roots have been said to appear at odd times of day, there are stories of normally shy creatures appearing to disturb people at inopportune times, even of daring foxes with oddly intelligent expressions showing surprising cruelty.
Biologists and doctors speculate on what a sample of this Weed might do spliced with other natives plants, chemicals and medicines.