User blog comment:TheHandsomePlant/Plant Leveling Data/@comment-24203813-20160330152136/@comment-26881942-20160403153514

No, the damage in the game code is counted by damage-per-second but no BITE!

Every zombie except Jurassic Zombie and Newpaper zombie take 100 damage per second, while most plants have a health of 300.

So Most zombies consume a plant in 3 sec but it appears that they take 5 bites, so it actually doesn't change anyway.