Encyclopedia

Plants' encyclopedia:
( * is an upgrade that can be bought from Crazy Dave's Twiddydinkies. )

( ** is not an upgrade, but can also be bought from Crazy Dave's Twiddydinkies. )

Zombies' encyclopedia:
Imps in I, Zombie are the weakest, taking exactly 3 normal hits.

* Means this zombie has a Giga form.

** Means this zombie has an Invisible form in Invisighoul.

*** Means this zombie does not appear in the almanac.

† Means this zombie has a smaller form in Big Trouble Little Zombie.

There are also Ducky Tube Zombie versions of Conehead Zombie and Buckethead Zombie zombies and the Zombotany Zombies (except the Squash Zombie).

References:
- videos Zombie-HP test by MrVuong313

- Gargantuar Imp HP test [clip]