Radplum

Radplums are radioactive plants, that undergo radioactive decay 5 times,after the 6th time,Radplum is turned to a stable state.

Strategy
Radplums,since they can damage zombies in 3x3 area by radioactivity,it's a good idea to protect it with a wall-nut and put infinut two tiles behind it and plantfood it.

Another good use is to plant them in lost city,since excavator zombies can throw it back- meaning it can damage more zombies with its radioactivity.

Almanac Entry
Radplum grew on a place, where nuclear missile tests were done. So you don't need to wonder now why it's composed of 70% radioactive stuff.