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Cardboard spawn consistently getting contaminated

 
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I am pretty consistently failing with cardboard spawn. I've been trying to clone king oyster and straw paddy by chopping up the stems and making cardboard burritos, but the cardboard gets slimy after a few days and within 2 weeks has green mold. Anybody have some troubleshooting advice?
 
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Location: Cache Valley, zone 4b, Irrigated, 9" rain in badlands.
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Perhaps use 0.3% hydrogen peroxide to soak the cardboard.

 
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Great idea Joseph. I had problems with stem butt/cardboard contamination too.
John S
PDX OR
 
The permaculture playing cards make great stocking stuffers: http://richsoil.com/cards
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