Hi all.... I have heard...not read...that cedar posts are a no no for grapevines....If that is so..then can someone tell me why? My late father-in-law planted several rows of grapevines and finally, after 7 years I got them to produce last year....the posts are rotting and now we want to replace them and we are getting advice without any reason why we can't use sturdy cedar posts.......can you help me.......Roses