When I find oysters - and they grow everywhere in Indiana throughout the summer and even into December some years - I will take some of the ones that are too far gone to cook up and simply place them on a downed tulip tree - especially at a split or where bark is ripped. Or the tops of tulip stumps. The white spores can easily be seen under the mushroom placed on the log. It's best to use recently dead tulip - though wait 3 or so months before inoculating in this way. I live south of Indy in the woods, so I have great access. It takes a year or maybe 2 - but generally the following season - before you will see oysters on the tree you inoculated. Regular rains help. You can water it if there is a dry spell and a water source is near. Also helps if the wood is shaded.