Seems like I was wrong about skill up, I thought it will be as 'easy' as dmm ones, but it was pure rng. 3 flowers feed only 1 skill up.
I have shit luck when it comes to skill up, my Di Yu have 3/4 equip slot yet still at 1/5 skill. At least I have Lilac as compensation.
Hoping I can reach 5/5 skill since 30% chance sounds good, and I have Megane.