Dave's mold colonies

Dave's mold colonies are green chunks of mold in Plants vs. Zombies 2: It's About Time that appear on certain tiles. They only appear when one of the requirements to earn a star is to not plant on them. They can be planted on technically, but the player lose the stars if they do (prior to the 1.7 update). After the 1.7 update, they appear on some levels as requirements to pass some levels (the stars are removed so no price other than the success of the level). In the current version, it is merely impossible to plant on them, so they cannot directly cause the loss of a level.

Ancient Egypt

 * Day 1, Star 2
 * Day 4, Star 1
 * Day 9, Star 2

Pirate Seas

 * Day 1, Star 1
 * Day 3, Star 2
 * Day 6, Star 3

Wild West

 * Day 1, Star 2
 * Day 3, Star 3
 * Day 4, Star 1
 * Day 7, Star 2
 * Day 9, Star 3

Ancient Egypt

 * Day 13
 * Day 19
 * Day 22

Trivia

 * Plants which multiply themselves under Plant Food, namely Potato Mine and Chili Bean, and land on a Mold Colony do not disable the challenge.
 * When the player completes a level with them, the Mold Colonies will start jumping.
 * They can also hide if the player hovers a plant over them.
 * As of the 1.7 update, the player can no longer plant on the mold colonies.