I think the growth medium must smell weird to cats. It certainly molds much faster than seeds in plain dirt. On the other hand, my cats like to dig in plain dirt, seeds or no seeds, so it could just be twice the fun.
If it helps, I can vouch for Etsy seller Demonwolf's catgrass--a full pound of plain seeds at the same price as a dinky tray from a pet store, and the shop says proceeds go to feed critters.
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timeasmymeasure
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Date: 2013-10-18 05:45 am (UTC)If it helps, I can vouch for Etsy seller Demonwolf's catgrass--a full pound of plain seeds at the same price as a dinky tray from a pet store, and the shop says proceeds go to feed critters.