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"I'm very taken by mythology. I read it at a very early age and kept on reading it. Before I discovered science fiction I was reading mythology."
- Roger Zelazny

Red Weed (Terraforming Plant)  
  A plant brought by the Martians that grew on Earth.  

As you will read in the text quote, the author is deliberately vague about the Martians intentions, if any, in terraforming Earth for their use.

Apparently the vegetable kingdom in Mars, instead of having green for a dominant colour, is of a vivid blood-red tint. At any rate, the seeds which the Martians (intentionally or accidentally) brought with them gave rise in all cases to red-coloured growths. Only that known popularly as the red weed, however, gained any footing in competition with terrestrial forms. The red creeper was quite a transitory growth, and few people have seen it growing. For a time, however, the red weed grew with astonishing vigour and luxuriance. It spread up the sides of the pit by the third or fourth day of our imprisonment, and its cactus-like branches formed a carmine fringe to the edges of our triangular window. And afterwards I found it broadcast throughout the country, and especially wherever there was a stream of water.
From The War of the Worlds, by H.G. Wells.
Published by Unknown in 1898
Additional resources -

Eventually, however, the weeds proved to be as little adaptable to Earth as the Martians themselves:

At first I was surprised at this flood in a hot, dry summer, but afterwards I discovered that it was caused by the tropical exuberance of the red weed. Directly this extraordinary growth encountered water it straightway became gigantic and of unparalleled fecundity. Its seeds were simply poured down into the water of the Wey and Thames, and its swiftly growing and Titanic water fronds speedily choked both those rivers.

At Putney, as I afterwards saw, the bridge was almost lost in a tangle of this weed, and at Richmond, too, the Thames water poured in a broad and shallow stream across the meadows of Hampton and Twickenham. As the water spread the weed followed them, until the ruined villas of the Thames valley were for a time lost in this red swamp, whose margin I explored, and much of the desolation the Martians had caused was concealed.

In the end the red weed succumbed almost as quickly as it had spread. A cankering disease, due, it is believed, to the action of certain bacteria, presently seized upon it. Now by the action of natural selection, all terrestrial plants have acquired a resisting power against bacterial diseases--they never succumb without a severe struggle, but the red weed rotted like a thing already dead. The fronds became bleached, and then shrivelled and brittle. They broke off at the least touch, and the waters that had stimulated their early growth carried their last vestiges out to sea.

Read this article on terraforming Venus for more references to this idea.

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Additional resources:
  More Ideas and Technology from The War of the Worlds
  More Ideas and Technology by H.G. Wells
  Tech news articles related to The War of the Worlds
  Tech news articles related to works by H.G. Wells

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