Welcome to GOY. I thought it was a hydrangea.

Welcome from me too.
It doesn't particularly look like the ones I grow. the one towards the back looks most like one as the leaves look matt. Did you plant seed or is it from under a bird table?

Thank you for your kind reply...I added white seed of sunflower but I am not sure of it. Thank you both of you....I love flowering plants no matter of which plants is it.