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Effect of acid rain on sunflower growthFeatured science projectScience project video


The hypothesis that sunflower plants will grow best at pH levels between 5.5- 7.5, is proven to be true. At a pH level below 5, the seeds either did not germinate or demonstrated stunted growth.

Acid rain is causing extensive damage around the world. Plants are not the only ones affected by acid rains. Entire lakes have lost their supply of fishes due to acid rain. This has affected the livelihood and source of food for the people living near these lakes. Building and cars are also being stripped of their paint due to acid rain. Bridges and other metal constructions are getting corroded faster causing the structures to weaken.

Also consider

What would happen if the science fair project were to be repeated using different acids like hydrochloric or nitric acid?

The science project can be modiied to compare the growth of different types of plants which may be more tolerant or less tolerant towards lower pH levels.


Acid rain’s effect on plants and wildlife -

Information about the autumn beauty sunflower plant -

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

Handle acid with care – use protective clothing/goggles.