Hydrangea / Ajisai

origin of readings :
It originates in "Adzusai" that is the archaic word of Japan.
Meaning of "Adzu" is gather, mass.
"Sai" is an abbreviation of "Sa-Ai". "Sa" is a prefix.
Meaning of "Ai" is indigo, deep blue.

meanings : The crowding small flower of indigo blue.

another pronunciation : Shi-You-Ka.
kanji meaning :
Shi = purple. violet. (= Murasaki).  You = sun. sunshine. the sunlight.
Ka = flower. (= Hana).