Why is it a hopeful sign that the Red Weed dies so quickly and thoroughly in Chapter 6 of war of the worlds?

The Red Weed dying quickly and thoroughly in Chapter 6 of War of the Worlds is a hopeful sign because it shows that the Martian invasion is not invincible. The Earth's environment is hostile to the Martians' Biology, giving hope that humanity can potentially defeat them using similar tactics. It also suggests the possibility of the Earth slowly healing and recovering from the devastation caused by the Martians.