My first year of planting corkscrew eel grass (about 3 years ago) mine spread nicely but then the drought dropped my water so much that I lost most of my beds but I did manage to replant some in deeper water. I can't see the corkscrew in the deeper water but I have a some of it floating to the top from my grass carp activity. So I am hoping it is established enough to survive reguardless of drought and grass carp. The winter cold here in east central Indiana never hurt my corkscrew.