ornamental grass collapsing
I am a novice gardener and planted some ornamental grasses in an small bed that gets lots of sunlight. The purple fountain grass really took off and after 9 months stands over 5 feet tall. It is now collapsing under its own weight and looks terrible. I had been watering it once every 5 days.
What maintenance should I do to make this beautiful grass stand tall again? Should I cut it? It is now July, I read that you should cut it in spring. Should I just prop it up with cages? Should I water less so it stops growing?
Thank you for any advice you can provide.