Any ideas on how to tack down a 13 Ft sea grass mat on my front porch?

I have an enclosed 3 season front porch, more like a sun room. The sea grass mat my mother put down about 13 ft long and maybe 6 ft wide, shifts upon walking. It isn't dangerous to the point of injury, but the pattern weave is skewed making it difficult to determine what a painted pattern would look like. Any ideas how to tack it down, right now there is very little foot traffic.

  5 answers