Heat-Turnip

Turnip-Mine is a instant-kill plant that has different range the longer he lasts

Almanac Entry
Turnip-Mine

Turnip-Mine can explode in different ranges the longer he lasts

Turnip-Mine can't decide in exploding with normal range or exploding with a long range so he just lets the nature decide

Strategy
Turnip-Mine can explode if stepped on by Zombies or biten by the Zombies, the longer he lasts though the longer his range and the more damage he can do, he grows everytime a minute in his range passes

Range
(C) leaves a crater

Trivia

 * Turnip-Mine has been thought about by the creator but keeps on forgeting it, until now!