I've had the same problem many times myself. I started using artificial
branches 5-6 years ago and they have really helped. I use black
zip-ties to attach them to the sides & bottom of the stand, any nearby
small branches and also to the side braces for the seat.
You may be able to find them cheaper somewhere else but here's a link
so you can take a look.
Hope this helps
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0004912415016a&type=product&cm Cat=SEARCH&returnPage=search-results1.jsp&QueryText=cover+branch&N=4887 &Ntk=Products&Ntx=mode+matchall&Nty=1& amp;Ntt=cover+branch&noImage=0