I first learned about this tactic explained at flower shows in England years ago, when large water-garden companies exhibited. The Royal Horticultural Society mentions how it works here: http://www.rhs.org.uk/Advice/profiles0500/algae.asp” class=”bbcode_url”> http://www.rhs.org.uk/Advice/profiles0500/algae.asp I don’t think you do this in winter by any means, but during the spring and summer into fall, when algae is in active growth, and you will need a lot of barley (which I then think you will have to remove once it does its job–which is why on a smaller scale I have seen the barley encased in mesh bags and "hung" in the pond, along the edges, where they’re easily pulled out). Not sure how you replicate this in a multi-acre pond; I have only small garden pools, and did years ago used to hang barley bags in them. To locate a grower of barley in any area, I’d start with the county cooperative extension service. You can find yours here if you do not know it: http://npic.orst.edu/countyext.htm
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.