Subject: I read of capilarry action in cut plants. I am trying it in a plant in soil

I am putting red food color direectly into the soil. It has been a week. 
How come it won't turn red like the celery did? I need an answer for my 
science project due real soon. I dont see any red growing up the stem Is 
this still called acpilarry action? QWill it grow up soon?

Re: I read of capilarry action in cut plants. I am trying it in a plant in soil