Organic gardeners avoid using toxic pesticides, so often resort to more difficult but entirely safe methods of dealing with pests. A tried-and-true method of dealing with slugs is to surround plants with used coffee grounds. But in the European Union, gardeners who use that method are breaking the law!
The EU has decided that anything used to control pests must be approved—and coffee grounds have not gone through the approval process. That, of course, will likely never happen. To be approved as a pesticide, a product must go through extensive and extremely expensive testing...
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Comment: And that is just one example. I recently heard that nettle water (water in which nettles have been soaked for 3 to 4 days) which is effictive to control aphids is "not approved" in biological agriculture and would therefore be illegal to use. Insane?