Well, I only used the wood shreds in a few pots. I'll monitor how they do.
Austin
does have tons of hydroponic stores. I've always been cautious of going there, because I wonder if cops will show up at my house in a few months looking for pot! They don't seem to have bark fines, but perhaps these
coco chips would work? I am afraid cocoa chips sequester too much water- this element's function is supposed to be to provide aeration for roots.
http://www.austinwoodrecycling.com/
They make the hardwood mulch and such out of the brush piles people put out for trash, so I'm sure it is a combination of branches and actual trunk wood.
They say the mulch is aged 9-15 months... would that be enough time for resins to break down? The mixture did appear partially composted.