Mystery Sprout

Mystery Sprout is a type of sprout that randomly turns into a plant the player may not have. The player can buy them from Crazy Dave's Twiddydinkies on the iOS versions of Plants vs. Zombies. In the shop they look like presents, but they have different colors than the regular presents. When the player purchases one, a plant automatically appears in your Zen Garden.

Mystery Sprout
It randomly turns into a plant, so the chance of it turning into a plant you don't have yet depends on how many Plants are currently in your Zen Garden. It costs $7,500 in Crazy Dave's Twiddydinkies.

Bronze Mystery Sprout
It has a 25% chance of turning into any plant you don't have yet. It costs $15,000 in Crazy Dave's Twiddydinkies.

Silver Mystery Sprout
It has a 50% chance of turning into any plant you don't have yet. It costs $30,000 in Crazy Dave's Twiddydinkies.

Gold Mystery Sprout
It has a 100% chance of turning into any plant you don't have yet. It costs $50,000 in Crazy Dave's Twiddydinkies.

Mystery Sprout Math
Because the chance of getting a plant you don't have yet is random, the expected cost of getting a new plant depends on how many plants you currently have.

Bronze Mystery Sprout
The expected cost of obtaining a plant you don't have yet is $60,000.

Sliver Mystery Sprout
The expected cost of obtaining a plant you don't have yet is $60,000.

Gold Mystery Sprout
The expected cost of obtaining a plant you don't have yet is $50,000.

Trivia

 * The Silver Mystery Sprout has a glowing-like appearance and it shines.
 * If you have already obtained the Enlightened achievement, the Mystery Sprouts will grow into a plant you already own, as there are no plants you don't own.