It seems a bit early to know that, yet. In my experience, the buds don't start forming until the nights are longer, as in September.

I agree with Tugbrethil. Just leaves for now, flowers come later - same for Asters.

yes it is too early they tend to start forming buds from now on and in my Yorkshire garden start flowering October / November.
how long have you had them and are they in the ground?

welcome to GoY by the way. :o)

If you bought them blooming this time last year, they were likely tricked into early bloom by manipulating the day length in special greenhouses with aluminum curtains. That is also a consideration if mums are grown too close to porch lights and the like, since they can delay or prevent bloom.