This is kanjji idiom that shows "simultaneous emergence of many talents and achievements." The pronunciation is "Hyakka ryouran". Flowers are indicating "Outstanding person". That is, Hyakka is indicating many flowers blooming in profusion. Ryoran is kanji idiom that shows flowers are blooming all over the place. Warring States Period of Japan, a lot of smart and great and strong samurais has existed. Kanji idiom "Hyakka Ryoran" is often quoted by the history book etc. in Japan.