It's usually better to communicate your needs in a proactive way, rather than telling him after the fact that he disappointed you. I am sure you would prefer that he do that to you. I don't know your particular situation, but I can tell you whatt things were like that in my first marriage. I had a tendency to be an "exploding doormat" I was the long suffering martyr, I never complained and never asked for anything, and my first husband used that against me. I reached a breaking point and left. It's not a healthy dynamic. I don't think it would have mattered, he was very self absorbed and selfish, but I had to own that I contributed to the dysfunction. I hate asking for anything, so I didn't, but that wasn't good for either of us. Needless to say I never got flowers.
In my second marriage I was determined not to do that. I still struggle with it, but communication is much better. I had to learn a different way to be. My husband doesn't want me to suffer in silence. Like anyone else, he doesn't like to be told he did something wrong, sometimes he is hurt or angry, so I try to keep that to a minimum. Sometimes you just have to let small things go. But you absolutely must communicate if he is hurting you in some way, don't wait until you explode. Be polite and respectful, but don't minimize the hurt.
If you want something to be different, like getting flowers, it would be fine to say so. You may think you are being very clear, but my experience with men is that you really can't be clear enough, most men communicate in a very straight forward way. It may just be something that is hard for him. Just say that you would love to get flowers because it would make you feel loved and wanted. If he does get you flowers, be very grateful and reciprocate in some way that makes him feel loved and wanted, a special meal, a back rub or.....
If your husband feels loved and appreciated, he is much more likely to do the things that makes you loved and appreciated.