We can access almost every style flower, all year, in Los Angeles.
Sometimes a certain flower can be imported when out of season, but in my experience they are either not as pretty as they are when they are in season or very expensive, or both. When you have a small budget go with flowers that are in season.
Peonies, ranunculus, dahlias, & anemones are seasonal flowers that are not available during every month.
Ranunculus and Anemones are springtime flowers that are typically available until late April.
Peonies are late spring and early summer. They start as early as the latter part of April and can be found until early June.
Dahlias are a summer flower and can be seen starting late June and through later September.