Drought Impact On Redwood Ferns

The native ferns that form a lush green under-story in coastal redwood forests are well adapted to dry summers and periodic droughts, but California's current prolonged drought has taken a toll on them. A comprehensive study of water relations in native ferns, conducted during one of the worst droughts in California's recent history, shows that extreme conditions have tested the limits of drought tolerance in these plants.

http://www.sciencedaily.com/releases/2016/02/160201122830.htm