Aquatic plants

 are plants that can only planted on water lanes, which only appear in the Pool and Fog levels. The four aquatic plants are the Sea-shroom, the Lily Pad, the Cattail, and the Tangle Kelp. The player can buy the Cattail at Crazy Dave's Twiddydinkies for $10,000. In the Zen Garden, these plants, with the exception of the Cattail, must be placed in aqua pots or moved to the Aquarium Garden.

Trivia

 * In the Zen Garden, the aqua pot for the aquatic plants is bigger than the Flower Pot for the non-aquatic plants if grown at least once by fertilizer.