the local electric company is busy trimming and mulching....so I got a load of free mulch. Would probably be mostly maple, but who knows really what all is in there. I have an open run my girls spend most of their day in and it has some low spots...right now, muddy low spots. Can I safely put this newly mulched wood in the open air run? I put in straw and grass clippings sometimes to give them something to scratch in and hopefully fill in eventually.....is this a good idea or not?