I guess nothing more than some RP.
There is an impact, for fire type plants 🙂
- Torchwood will have its flames go out, when it will look sad, then the flames will reappear. So far, this is the only place it can be seen without its flames.
- Pepper-pult is extinguished and then reignites within a few seconds.
- Fire Peashooter turns into a regular Peashooter, then burns back into a Fire Peashooter again.
- restores its lava after a period of time.
- Jack O' Lantern restores its fire after being put out.
(from the wik)
It definitly add deeper meanings in the game 😛