I get asked somewhat often about composting play doh…so can you? Probably.
The homemade stuff? Oil, salt, flour and water, right? That sounds fine. I doubt you’ll have enough salt or oil to cause a serious imbalance in a compost pile.
But how about Play Doh brand stuff? I dunno. Check out their FAQ: http://www.hasbro.com/playdoh/en_US/faq.cfm
I can’t stand it when companies say their product’s makeup is proprietary. Maybe I don’t want to put my trust in a product that won’t say how it’s made. The company states “non-toxic”, and it also names all the ingredients you need based on the homemade recipe…so why would I buy their crap then?
Here’s a recipe for play doh that you can definitely compost: http://www.instructables.com/id/How-to-Make-Playdough-Play-doh/
FAQ location has changed. It is now: https://playdoh.hasbro.com/en-us/faq