This lab allows students to observe the effects of pollution on plant growth. Any type of plants can be used, but I found that geraniums and impatiens work well. These two types of plants can be found easily in the spring. You could also modify the lab and only use one type of plant in all the set-ups.
Students use a variety of pollutants such as vinegar, bleach, salt and oil to water their plants. They also have control plants. Students take care of their plants and recorded data daily for two weeks. Then they share their data with the class.
To do this lab you will need a class period to set it up, then about 5 minutes daily for students to check their plants and record data, and another class period at the end of the two weeks for students to compile their data and write their conclusions.