I'm surprised no one else has responded. I have whites and colored types. They always bloom, but none of them are blooming yet. When you posted, I hadn't seen any blooming anywhere, but yesterday I saw some colored ones in full bloom. Mine are still not blooming. I suppose conditions vary widely. I wouldn't worry, these plants are VERY hardy.

Sun amount. Just wait.

Thanks folks, I'm a total novice about them. My Mother in Law is close to tears over the fact they weren't blooming. I'll tell her to settle down and wait.

Different varieties bloom at different times. There are some white ones that bloom way earlier than the other colors. If you have to have them all in bloom at the same time you need to buy them in bloom at the same time. They keep coming up with new ones and some of them will bloom pretty much all summer. Around my neighborhood there are white ones that bloom in June and white ones that bloom up til first frost.

My red ones aren't open yet and my watermelon pink one's haven't opened either.

Thanks John, I think her biggest issue is they aren't behaving like she wants them to. She is in her 80's and very demanding about how she wants things to be. I've spoke with her and delivered the above advice but she is just furious with them because they aren't blooming when she wants them to. Thank Goodness I wasn't the one who suggested she plant them. I'm sure most of you who have elderly relatives understand what I mean here. If she has them taken out I may go rescue them. Other than that I'm backing out of the room. LOL They are very nice examples of Crepe Myrtle. Thank you all so much for your advice and recommendations!!

I mis-spoke, my watermelon pink one is just starting to open. Next door neighbors pale pink ones are fully open now. My short deep red one doesn't show any signs of blooms.

Most crape myrtles are a mixture of a few species, so just because the bloom colors might be the same the genetics involved could be different. The breeders are trying to get them to bloom longer and not suffer with powdery mildew.

At least your mother's primary complaint is with a plant and that it isn't blooming at the right time - things could be so much worse. My mother wouldn't step foot outdoors and couldn't tell the difference between a crape myrtle or a dandelion.