That is our Killer Planet. It defends with fire. Stay clear.
— Doom's Eye, Shadow the Hedgehog
Killer Plants are large aggressive flowers that breathe fire and rapidly try to knock Shadow out of the way. They can be temporarily shrunk into a ball if shot with the right weapon, but they cannot be killed. The player needs to keep moving to dodge their attacks. Due to their resemblance to earth flowers, they are likely plants mutated by the Black Arms.