What should be my control experiment?!? (1 Viewer)

[yasminee96]

For the dotpoint on the effect of environment on phenotype, my experiment is that i would grow hydrangeas in both acidic and alkaline soil, and see the difference it makes.

Seems prettty straight forward however i have no idea as to what i should make the control?

I need to remove the independent variable, but how do i remove pH of soil? Would i just use neutral soil?

Please respond ASAP

 

[soloooooo]

Yes, neutral soil.

 

[yasminee96]

Yes, neutral soil.

I read that neutral soil actually makes the flowers a deep pink though

 

[jamesischool]

control would be no soil? either that or a neutral pH of 7 lol