Early decay of Phragmites thatch: an outline of the problem. 1989. Aquatic Botany. 35, 12932.
In Britain, Phragmites thatch is expected to last 50-80 years. Reports of breakdown within 4-10 years became significant by 1970, and caused concern by 1983. The complaints are associated with soft, weak reed. Moisture is said to alter breakdown.