When is Royal Blue in season for colors?

I'm getting married next year in July(approximately) and am getting a head start on ideas for my budget(ish) wedding. I'm struggling to find places that I can physically see the flowers I'm wanting to buy for all of my floral arrangements. Both my fiance and I are low maintenance so we aren't wanting a lot of decor, but I would like to make it special, as it's our wedding. I'm needing faux flowers due to the fact that I have fairly bad allergies and I would prefer not sniffling and sneezing from them. Does anyone know what season royal blue is prevalent in? All I'm seeing is aqua and turquoise around my area at the moment so I assume this isn't the best season. I'm wanting to diy most of my centerpieces and decor, so if anyone has any suggestions as well, I would greatly appreciate it. Honestly, I'm overwhelming myself with predicted expectations of our guests, as we both have large families. So any help would be fantastic. I'm just a huge worrier haha