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Botany Science Fair Project

The Effect of Water Hardness on Seed Germination

The Effect of Water Hardness on Seed Germination | Science Fair Projects | STEM Projects
Do you want to know if watering plants with soft water helps seeds germinate faster? In this science project, you'll find out by testing the germination of seeds in hard, tap, and soft water.


The hypothesis is that watering plants with soft water will help seeds germinate more quickly.

Method & Materials

You will label three beakers as "Hard", "Tap", and "Soft". Place 20 seeds in each beaker, and fill each beaker with 200ml of water. The "Hard" beaker will have 5mg of calcium added, and the "Soft" beaker will have 10ml of water softener added.
You will need 1 packet of black-eyed Susan seeds, 3 large beakers, 3 balls of cotton, 10ml of water softener, 5mg of calcium, tap water, 1 measuring cylinder, and 1 black marker pen.


The results showed that the rate of seed germination was almost the same for all types of water used. This disproves the hypothesis that watering plants with soft water will help seeds germinate more quickly.

Why do this project?

This science project is interesting because it tests the effect of water hardness on seed germination, which is an important factor in plant growth.

Also Consider

Variations of this science project could include testing different types of plants, or testing the seeds in different environments such as under the sun, in a shaded area, or indoors.

Full project details

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

Related videos

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