Just went back and read all 5 pages of posts. This is a great forum. When I looked up planting in styrofoam there were other flowers planted in coolers. Now I have to look up if we can glue pieces together without melting the foam.
Tomorrow is my weekly thrift store day and there is a Korean market where I found the styrofoam. Hope I can find some English speaking guys to ask about them. I'm allways looking in dumpsters for something special.