Is that a seedling? I ask because of the morphology of the leaves towards the bottom of the photo. It's possible seedlings could bloom larger than cutting-derived plants.

I have seen plants in gallon sized pots in bloom many times at local nurseries.

Below is a link to the smallest blooming plant I found with a quick search online. It suggests yours is large enough.

Here is a link that might be useful: {{gwi:442424}}

Thanks Mark, maybe I will get some blooms before long then. I purchased the plant about 3 months ago, and it was only about 5" tall. I think it was a cutting, but I don't know that for sure.