Does anyone know what this is?

This was from a bunch of seeds I planted in a growing kit. Unfortunately, I threw away the envelopes that held the seeds and I did not write them down so I have no clue what this plant/flower is. I believe I only was growing flowers so I believe this is a flower.

However, it could be a weed or something else I suppose. It got really big after I took it out of the container. It is taking up a lot of space if this isn't anything I might as well get rid of it or transport it. I just want to know what this could be. I wish I kept the bags for the seeds or wrote them down. I don't remember seeing a plant/flower like this so it could just be some odd plant they mixed in?