Weird,I just got past that part..-w-
Okay,you can not get past those grunts right then.First,you have to go to your right and go to Valleyworks.You fight a grunt,and he locks the door on you once you win,saying you need the key.Then,go back to that one flower town and go to the top left corner of the town.You will see an entrance to a forest,so go in there.Then you fight two grunt that were trying to steal from a man.Once you defeat them,the man will see the key and give it to you.Once you have it,you should know the rest..o3o
When the 2 grunts are in front of the way to the big part of the flower field,go to the windworks,and when the grunt locks you out go to the big flower field,battle the grunts and win,then you get the key to open the windworks