Here's basically the team I used to take out nushi 9 and it wasn't a great deal different from what I used to take down Dendrobium either, if memory serves.

Flower Knight Tactica-afterparty.png

Team 1 takes out the trash mobs on the upper path and team 4 deals with the trash on the lower path.
Team 2 is the first to reach bosses by virtue of having the highest speed and its task is to take out the first boss on the crossroads and the first stage of the final boss.
Team 3 is basically the best I could do with leftover knights.

I think if I didn't happen to have Meconopsis with her evasion, it would have been pretty much impossible to beat either of them.