Leonardo teaching kadō to Bea at the Splinter Dōjō.
Kadō (華道, meaning "way of flowers"), also known as ikebana (生け花 or 活け花, meaning "arranging flowers" or "making flowers alive"), is the Japanese art of flower arrangement, with an ancient history going back to the 7th century.
IDW[]
In the IDW continuity, TMNT #101 floridly revealed that Leonardo is a kadō practitioner, and during his time at the O'Neil Farm in the months following his father Splinter's death, he set up a greenhouse to practice his art. In TMNT #104, Leo suggested teaching kadō along with calligraphy and martial arts at the new Splinter Dōjō the Turtles planned to set up in Mutant Town. The dōjō opened in TMNT #105, and kadō was one of the classes Leo taught to new students of the Splinter Clan.