Potato Sprout

The Potato Sprout is the second plant obtained in Victorian London Potato Sprouts lob potatoes at half the rate of Cabbage-pults that do normal damage to and poison the zombie they hit. The potatoes can also blow up the exhaust pipes of Steamroller Zombies.

Suburban Almanac Entry
Poisoning zombies and blowing up machinery is a little too satisfying Potato Sprout. One need to look no further than the smug grin he wears during lawn defence to see the obvious joy he gleans from zombie destruction. Do not let this fool you though. Potato Sprout is no ogre. He is a very sensitive and insecure individual. Deep down, he feels guilty of his role in the Great Famine. He just wants to give a little back.

Plant Food
Grows poisonous tubers in its lane that expel noxious gas in each tile. The gas lasts for 10 seconds and does huge damage over this time.

Strategies
Potato Sprouts are extremely useful against Steamroller Zombies, as they can destroy them in three hits. Two per lane could be useful to more quickly destroy them. However, to regular zombies, Potato Sprouts only do very low damage upon impact. In these instances, the poison effect does the majority of the damage and hence more than one Potato Sprout per lane would be unadvisable.

Trivia

 * This is the second poisonous plant following the Nightshade.
 * The noxious gas is also used by the Nightshade's plant food effect.
 * Potato Sprout is the first lobbed-shot plant in PvZ2 with a plant food effect that does not spew multiple projectiles.
 * This is the third lobbed-shot plant in PvZ2 that doesn't use a basket and the second of these to fling projectiles.
 * The plant's catapult arm is constructed of tubers from a potato sprout (hence its name).
 * The projectile is presumedly an unripe potato growing at the end of the tuber. Unripe potatoes have a poisonous compound called solanine which provides the green colour of the potato.
 * This explains why the potato poisons zombies.
 * The potato blowing up exhaust pipes is a reference to the real life gag of blowing up the exhaust pipes of cars by clogging them with a potato.
 * The Great Famine was a period of mass starvation, disease and emigration in Ireland between 1845 and 1852 caused by a disease - known as the potato blight - that spread amongst their staple potato crops.