echinacea

Alright i started growing for the first time about a week ago and i put various household vitamans in the soil mix and found that the two i put echinacea in had sprouted up almost double as fast as the others. I swaped out the soil for Miracle grow for seedlings and they are all roughly the same size the two are jsut a little bit bigger. I'm wondering if its because of the nutrients they fed the echinacea flower. can anybody help? here are some pics.

Interesting concept, but too early to tell really, see how they go over the next few weeks.
btw, tin foil is not good, it reflects heat and causes hot spots.
Flat white paint, panda film or mylar are much better.

alright ill have to do somthing about the tinfoil.