Grass Effect

Difficulty: Easy

Grass Effect is an achievement in Plants vs. Zombies 2: It's About Time. It requires the player to spend 500 sun which is equivalent to ten taps through the use of Magnifying Grass. It is worth 500 XP on Google Play Games for Android devices and ten points in Game Center for iOS devices.

Strategies
This achievement can be done easily if you generate enough sun quickly enough and use Magnifying Grasses as your only offensive plant. A good level for this is Far Future - Day 21, as there are four red square Power Tiles in the three backmost rows where you can plant your Sunflowers or Twin Sunflowers for maximum effect. It also works perfectly with the fact that you have to make at least 500 sun and can only have a maximum of 16 plants at a time.

Another good way to achieve this is to play higher levels of Endless Zones where Gargantuars are usually present. It requires six or seven hits for them to die. Just tap it relentlessly before it gets a chance to use its last resort.

Trivia

 * Its name is a portmanteau between "grass" and "Mass Effect", a game by Electronic Arts.
 * It refers to the greenhouse effect and the Mass Effect series.
 * It is a pun for Greenhouse Gas Effect. The greenhouse effect is a natural process by which some of the radiant heat from the Sun is captured in the lower atmosphere of the Earth, thus maintaining the temperature of the Earth's surface. The gases that help capture the heat, called “greenhouse gases,” include water vapor, carbon dioxide, methane, nitrous oxide, and a variety of manufactured chemicals.