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Examining the effect of watering on plant growthFeatured science projectScience project video


The objective of this science fair project is to determine the effect of different amounts of water on plant growth. The experiment will be carried out by watering mung beans with different amounts of water, and observing their rate of growth


The greater the amount of water, the faster the growth.

Scientific Terms

Water retention, moisture


Water and plant growth

Water sustains life, and is therefore important to all living organisms on our planet. These include plants, which will wilt, become dry and die in the absence water.

The actual amount of water needed by a plant to grow will depend on the type of soil used, the size of the pot, the species of the plant and the age of the plant. A soil’s water retention properties will determine the amount of watering required. Soil  that is poor in retaining water will require more frequent watering, whereas soil that has good water retention properties will require less frequent watering. The size of the pot is also important, as it determines the amount of water that can be added to maintain the required soil moisture.

The size and number of leaves, together with the size of a plant’s stem, will give us an estimate on the appropriate amount of water that a plant needs. Young plants tend to require more frequent watering to maintain the moisture near the surface of the soil, as its roots have not grown deep enough and will therefore only be near the surface of soil. On the other hand, an older plant will require less frequent watering .

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Complexity level:
Project cost ($):
Time required:
Preparation will take approximately one day, while observation and recording of data will require ten days
Material availability:
Easily found
Safety concerns:

Basic safety requirements