Northern Wild Oats                                                                    Seed heads

Chasmanthium latifolium, also known as Northern wild oats, and Northern sea oats (although it does not grow near the sea).  A warm season grass. strictly clumping.

Chasmanthium latifolium     leaves start green, turn to amber/gold in fall, 3-4' tall   seed heads open light green, turn to red/brown, then to buff, 4' tall     zone 5     prefers light shade, but will also grow in full sun