Ohhhh, I love that question!
Apologies ahead of time, I'm not the best with using the scientific names, so I hope this still makes sense.
I kind of debated that when I first came up with the idea, too. What I ended up coming to was that it tends to be more about the petals and what they represent. It would also be incredibly awkward in some situations if Mila is walking about and someone with a long flower cluster happens to turn about. The image of her getting smacked with flowers only she can see is amusing, but it would be a bit clunky in several aspects. I ended up figuring that the flowers she sees aren't necessarily attached to a stem or the groups they would be in their true nature.
An example of this would be the sunflower. The character who has it doesn't have any sort of stem or inflorescence, though I don't believe I did much describing of it. It is more just that the flower(s) extend almost directly out of the chest area. Others, like the orchid, would also not have any connections besides the flower, sepals, and its attachment to the chest.
Sorry if I got anything mixed up! Absolutely love plants and flowers, but I'll be the first to admit my understanding of them in the scientific sense is rather basic. Thank you for the suggestion! I'll certainly look into it, and I look forward to your future updates.