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What's growing on, Beehaw?
(beehaw.org)
All things green, outdoors, and nature-y. Whether it's animals in their natural habitat, hiking trails and mountains, or planting a little garden for yourself (and everything in between), you can talk about it here.
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I'm a little surprised your local birds let them get to that stage, to be honest! I've only threshed them once, for reseeding purposes, but did so with ¼" hardware cloth, framed with 2" sides, over a wheelbarrow. The mesh catches the seeds but lets the duff fall through with a little agitation. Otherwise I've hung them upside down within reach of the birds we raise for them to enjoy.