Pistachio

 (开心果; pinyin: kāixīn guǒ) is a plant only available in Plants vs. Zombies: All Stars. It attacks zombies by shooting lasers at them. It is the downgrade of Hazelnut. It is unlocked by collecting 10 Puzzle Pieces.

Plant Food upgrade
Low Level Heal: Heals all plants for three turns. It needs Gentle Plant Food to be activated.

Trivia

 * In reality, the shell of the pistachio is beige colored, but it is sometimes dyed red or green for sold pistachios.