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Old June 28, 2016   #2
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,141

Water retaining crystals in the mix is probably not a good idea. I haven't heard anyone say but bad things about them.
Still, things shouldn't be that bad, I would think. Maybe check the pH.
For improving outside soil, compost is the best bet I would say.
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