hi, I have a deschampsia flexuosa tatra gold and 3 of the stems/stalks have bent.. the rest is doing really well. it is in a square pot and has multi purpose compost. I have only just read it needs other types of soil?
I don't find that exact variety but deschampsia flexuosa prefers a sandy soil in its natural habitat. Your soil may be too rich. Try adding about 50 percent sand to the container.