How do plants grow? In this experiment, you will create a mini greenhouse to learn how plants depend on sunlight and water. Place seeds in a Ziploc® brand sandwich bag with a wet paper towel and put the bag by a sunny window. Record your observations daily to see how long it takes for the seeds to sprout and grow leaves. What do you observe?

Learn more:

When the seeds have sun and water, they sprout. But do they need both sun and water? Make multiple window greenhouses and test it out! What happens if you place the seeds in a dark room with water? Or in a sunny spot without water? Or even in a dark place with no water? What do you see?

Connections with Next Generation Science Standards (NGSS)

Ecosystems: Interactions, Energy, and Dynamics 2-LS2-1.

Plan and conduct an investigation to determine if plants need sunlight and water to grow.

Create a window garden that shows how sunlight and water help plants to grow, then experiment further to test the effects of each variable.