Petunia Question

For some reason I don't seem to have a lot of success with red Petunias, all other colours are fine - particularly the purples and pinks.  Anyone else have this problem?

I had some from T&M this year and apart from one all the other red ones have failed - it isn't just these from T&M, every year the reds never seem to do as good asthe other colours.

I don't know veggie, i've noticed that some of the same type of flowers grow bigger than others, I weed,feed and water them equally, maybe that's just how things are,