I think this trend kicked off at Coachella and the summer vibe just kept it going. Everyone from Kate Middleton to Vanessa Hudgens has been sporting one.
If these are to bold for you, try a head wrap with buds rather than the large sized flowers. There are tons of options at Asos, UO, Nordstrom and at Forever21 (some under $10!).
Or, you could even go with a flower hair accessory like a hair clip or alice band to amp up your style as you go about attending one wedding after another this summer.