I found a way to give them new bedding the closest feed store is 30 minutes away and I’m pretty low on money so I mowed and used the grass (chicken safe grass) as bedding
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I appreciate the “thinking outside the box” approach!
However.
You are going to need to get in there w a rake and toss at the least daily, twice (or three times) daily might be safer depending on the temps and humidity where you live.
Having horses.... I can say w certainty that cut green grass that isn’t turned can mold quickly, and can get HOT quickly as well.
....but I would think you will be ok as long as you “toss/rake” it. A fan in the coop would also help it dry out more quickly.
Just watch for mold, hot spots, or any area that “poofs” a “cloud” of “dust”
Aka mold spores.
You will have to go back to the drawing board if you see that.
Dealing w respiratory issues w your flock will cost a lot more (time, effort, meds, and possible losses) than taking the time to keep tossing the grass clippings, and honestly- all of that will take a lot more time and effort than taking the trip to the feed store to get either clean straw for bedding (if you have a dry place to store it), or pine/ for shavings in bags (which are already wrapped but still should be protected from severe weather, in a shed, under a tarp, whatever you are able to do)....
IMO
Is worth the trip and get enough of whatever you can safely store to make it worth the trip...
If you have the ability.... I would also suggest going on
Amazon and ordering some VetRX... just in case you end up w mold before you realize you have it... it is basically like Vicks VaboRub for your birds. But you would need to have the new bedding in the coop (IF mold becomes an issue), before applying the VetRX...