The Science of Barley Straw: How Conventional Barley Straw Bale Combat Blanket Weed

For decades, pond keepers have relied on a deceptively simple solution to fight unsightly blanket weed (filamentous algae): the humble bale of barley straw. While it may seem like folklore, the effectiveness of barley straw is rooted in a fascinating microbial and chemical process, making it a natural, science-backed approach to pond health. Here is the scientific explanation of how a conventional barley straw bale works to maintain a clear pond.