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Effect of milk on plant growthFeatured science projectScience project video


This science fair project was conducted to determine if watering plants with milk affects their growth. The experiment was done using tomato plants and watering them with water and milk.


Using milk to water plants will help them grow better.

Scientific Terms

Fat, lactose, carbohydrate, nitrogen, calcium, photosynthesis, dehydration, transpiration, bacteria, fungus


Milk and plants

Most of the ingredients found in milk are not required by plants. Fat, lactose and carbohydrates found in milk are not essential to plants. Proteins in milk are rich in nitrogen but they are not in a form that plants can synthesize. However, milk contains calcium and some minerals that may help plants grow better.

Plants get most of their nutrition directly from soil. Water is very important for plants to grow and remain healthy. During photosynthesis, plants use water and carbon dioxide to produce sugar and oxygen. Water is also used to transport minerals absorbed from the soil to other parts of the plant. Plants also need water to prevent dehydration and for transpiration.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 14 days for observation
Material availability:
Easily found
Safety concerns:

Basic safety requirements