Chemicals

Chemicals are an environment modifier in Plants vs. Zombies: The Cure. They have varying effect, depending on what color they are. They are spawned from broken Bottles or Experiment Tanks or appear on the floor naturally.

Effect
Chemicals fade over time, depending on how many zombies/plants it has affected. Initially, it takes 30s to despawn, but each additional affect makes the remaining time decrease by 25%.

Strategy
Although the Purple and Orange chemicals can be a nuisance, keep in mind that there is a 40% chance of semi/purely beneficial chemicals spawning. If you know that a chapter will include these, try to dedicate part of a Greenhouse to growing Sweet Potatoes, and/or Garlic. Light Blue chemicals can be combined with Snow Peas to reduce zombies to a crawl, while Green chemicals can boost your offensive or defensive line. Finally, if a certain Chemical puddle is extremely annoying, you could funnel weak zombies to it to make it go away faster, or use Puke-Cumber, Electrifern, or Hose Rose to override it.

Trivia

 * It is the first Environment Modifier that directly affects plants and zombies.