Questions are what this place is for. If I didn't want to answer them, I would come here

I used various methods for securing the plants to the foam. I used string and needle to basically sew the plant up against the background. I would sew the string into the foam and tighten it so the plant was held against it. I also used staples and paperclips to pin the plant against the foam. I never punctured the plants ofcourse, only puncture the foam.
I also much prefer something called Jungle Mix. Its a mix of bark chips, sphag, and soil. Very good stuff. I found it at my local petshop.