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Consequently, how long does barley straw last in a pond?
4 to 6 months
In this manner, can you put too much barley straw in my pond?
The most common application is about two to three bales per surface acre of pond (or about 10 to 25 grams of straw per square meter of pond area). However, overdosing the pond with barley straw may cause fish kills because the straw deoxygenates the water as it decays.
In general, research and anecdotal evidence suggest that barley straw is effective in controlling planktic algae, and will clarify water that is green from algae. Using barley straw in ponds is not known to cause harm to people or to any higher plants or animals.