This paper toy is the Flower Pot, a plant that is only recommended on roof levels, based on the video game Plants vs. Zombies. It allows the player to place a plant on an otherwise unplantable surface, much like the Lily Pad's use in pool levels.
While it is intended for use on the roof, they can still be planted on a regular ground tile, but they cannot be placed on Lily Pads, probably because the player cannot plant a Potato Mine on the Lily Pad. Spikeweed and Spikerock cannot be placed on it. [Source: wikia]
You can download this papercraft template here: Plants Vs. Zombies - Flower Pot Free Papercraft Download