It probably needs more time. It had to take time to regrow new feeder roots that were lost when it was transplanted and then had to start getting into a growth cycle. They bloom on new growth so that's what needed to happen. I bet it will start blooming very soon, assuming you had some new growth going on it since it was transplanted.

funny you should say that, Love the Yard... I live in the same area as you and haven't had any blooms myself for the past 2 months. they were freshly planted in march at about 1.5ft tall, and have grown taller than me by now (6ft)!

just today, i got some fertilizer that's supposedly designed for hibiscus and just applied it a few hours ago. i'll let you know if my experiment works, but maybe you should try applying some fertilizer too. it can't hurt, and it could be the solution to your bloomlessness (hopefully mine too!)

hope that helped!

Will