What are natural mage ways 2 induce labor?

dr has oked me 2 try anything "natural" im 37wks and dr wnt let me go 2 38 so at most i have a wk left but he's ok'ed us 2 try and naturall induce. we've tried ..no luck..wanna try mage any other ideas? heard of just about anything pineapple, bump rides,castrol oil (dnt wk btw), blk & blu cohosh tea..etc!