Plants Galore

At some point of the game, you would receive a Almanac. It shows you every plant and zombie that you have seen. You can use the Almanac by clicking on it on the main menu or before starting a level. Here are every single plant in the game:

Day Plants

Peashooter

Sunflower

Cherry Bomb

Walnut

Potato Mine

Snow Pea

Chomper

Reapeater

Lily Pads

Squash

Threepeater

Tangled Kelp

Jalapeno

Spikeweed

Torchwood

Tall Nut

Cactus

Blover

Split Pea

Starfruit

Pumpkin

Cabbage-Pult

Flower Pot (yes.. this IS a plant)

Kernel-Pult

Coffee Bean (useless if you plant it on day plants)

Garlic

Umbrella Leaf

Marigold

Melon-Pult

Night plants
Puff-shroom

Fume-shroom

Grave Buster
Hypno shroom
Scaredy-shroom
Doom-shroom
Planterns
Magnet shroom

Upgrades
Cattail

Cobcannon

Gloom-shroom

Twin sunflower

Gattling Pea

Golden Magnet Shroom

Imitator

Wintermelon

Spikerock

Braaaaaains...