Dianed123, you did overplant. Miracle-Gro also makes a Bloom Booster fertilizer. I have used it for heavy bloomers in the past after it was recommended to me from a nursery owner here in NJ. His plants always looked better than everyone else's. It is 10-52-10.
We had a member at our community garden plant a mix like yours very close too. Maybe it is the same mix. His grew very tall, like 6 or 7 feet, maybe more. His were in a raised box filled with compost but it was only 2' x 8'. They turned out to be fall blooming plants. They bloomed a lot once they started and bloomed until frost. They reseeded every year until we pulled them out as they would flop and block the pathways.
