Thanks for the reply Zach.
The thing about straw, or any other agricultural product, is that you never really know what's been put on it. The difference with something like straw, which goes directly on the ground, or the garden, is that the effects are immediate. That is, stuff stops growing due to the residual herbicides. I would think that permaculture would be for people to gather the material from either their own location, or from a plant that never requires any sort of pesticide, like pine needles and twigs.
I'm experimenting on how animal manure with wood ash can render the nasty stuff in pine safe for mulching the soil. as I haven't read much about pine as a mulch base on this forum, I might be barking up the wrong tree. Hopefully not though, as I'm surrounded by pine forests.
