Mondo grass

So, while I was at Petsmart today, I saw what I thought was dwarf hair grass. It only had its scientific name on the tag, so I wasn't sure. I came home, googled the name on the tag, and discovered that it was actually a non-aquatic mondo grass plant. Oops.

I know that the leaves will rot underwater, but what about the roots? I already have some lucky bamboo and mini palms with their roots submerged in this tank, and I think the mondo grass would be a good addition. Will the roots still rot if the leaves aren't submerged?