Here's the question I pose for debate..... Orchid Bark is a must for substrate or Fir Bark. I read a review of a package of Orchid Bark and it said "Very little bark, had to pick it out. Mostly wood not Bark." Well most dimensional lumber is made from Douglas Fir, so what if I put a bunch of 2x4's in my chipper. Of course no sharp, large, or dangerous pieces...of course. Is there a difference in using the wood from the bark, especially when ALOT of orchid Bark bags contain chipped wood.