1.   The red weed bordered the site of the devastation.

2.   He was more concerned about the red weed paralysing the planet.

3.   The more serious threat of the expanding red weed had taken over as the immediate concern of the controllers.

4.   The red weed was taking possession of the surface of the planet.

5.   Would the red weed affect the time machine?

6.   As they approached the castle they realized that the advance of the red weed was increasing in speed.

7.   Thomas moved, knocking it into the red weed.