O_o

To beat Bloomsday (the "plant boss"), you have to attack his pot. He normally sends two
little spiky dudes and/or tries to blow you away (literally)after a round of beatings.
When he's at half his health, he puts a spike wall. When he tries to blow you away, press
and hold down on the control pad (while avoiding those spiky dudes. Good luck!
-Boss Master

The above answer was me. The name of the "spiky dudes" are called "bumbleprods".