What common flower seed should I use for a science fair project?

I'm going to give different types of liquids to a certain flower.


which common flower should I use?


something like sumflower?

What common flower seed should I use for a science fair project?
Yes, sunflower seeds take as little as three days to germinate. Very good guess. You can use sunflower seeds, or Brassica rapa. Picture here at second link of sunflower seedlings.