Natural floral flavor in a tea leaf

Floral note is one of the most frequently used term in tea taste description. Where does it come from? How come broccoli does not have a floral note, but a tea leaf does?

Oolong tea naturally posses lovely floral aroma, especially those grown in high altitude mountain ranges. The climate provides what it takes to produce high quality tea. Cloud hovers around 800 meters above sea level, tea grown at that altitude has the best flavors. Cloud provides constant moisture and blocks direct sunlight, however ultra-violet ray can still penetrate thick cloud layers, providing light for leaves to grow at a much slower rate, chlorophyll, tannin, essential oil concentration is higher than lower altitude plants, hence fuller in flavor and body with more intense aroma.