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Botany Science Fair Project

Earthworms and Plant Growth

Earthworms and Plant Growth | Science Fair Projects | STEM Projects
Earthworms are segmented worms that live in soil and create networks of tunnels. They feed on soil and decaying organic matter, and return nutrients to the soil as castings. Could these earthworms help plants grow faster?


The hypothesis is that the presence of earthworms in soil will help plants grow faster.

Method & Materials

You will need to label 6 small plastic pots, fill them with soil, add 10 earthworms to 3 of the pots, and plant 10 tomato, green bean, and radish seeds in each pot. Water the plants once a day and observe the results.
You will need 1 packet of tomato seeds, 1 packet of green bean seeds, 1 packet of radish seeds, 6 small plastic pots, soil, 30 earthworms, tap water, 1 measuring cylinder, and a ruler.


The experiment showed that the plants grown in soil containing earthworms grew taller than the plants that grew in soil without earthworms. This proves that the presence of earthworms in soil does help plants grow faster.

Why do this project?

This science project is interesting because it shows how earthworms can help plants grow faster. It also shows how earthworms are an important part of the ecosystem in our gardens.

Also Consider

To vary the experiment, you could try using different types of seeds, such as corn or sunflower. You could also vary the amount of moisture in the soil by watering and not watering some plants.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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