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This could have also gone under my topic for household tips, but I decided more people will probably use them outdoors, so chose to put it here. Some good ideas here.
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Used coffee grounds will also change the color of certain bushes and their flowers (like lilacs). That could easily be an old wives tale, but I remember the old ladies from my small hometown doing this. Some of them even ended up with pink lilacs over a few years time. Anyone know about this subject?