Below is a list of all the available elements in the Plants group in Doodle God across all 4 episodes.

Episode 1:
Coffee
Fern
Grass
Palm Tree
Reed
Tobacco
Tree
?
?

Episode 2:
Apple
Coffee
Fern
Flower
Grass
Palm Tree
Reed
Sunflower
Tobacco
Tree

Episode 3:
Apple
Coffee
Fern
Flower
Grass
Palm Tree
Reed
Sunflower
Tobacco
Tree

Episode 4:
Plants Group does not exist in episode 4.