Commercial potting mixes are made of peat moss, finely ground bark, coir, or a combination of those with either perlite or vermiculite added for drainage. Something sold for use as mulch will probably be too large for a potting mix.

Here is a link that might be useful: potting soil recipes

THanks for providing the link with the soil recipes and taking time to post on my thread.

Well the mulch I would be using as I said is double shredded. It basically looks like a fine powder; the bits of mulch don't look anything like normal mulch does, that is they're not in lg. chunks.

Also the recipe I use calls for 2-3 cubic feet per 30 gallon batch. When I mix up my soil less mix, I measure eveything into a container, and measure everything in the soil recipe in gallons.

Converted to gallons, how much is 2-3 cubic feet in gallons?

They're very small in size with the double shredded stuff. Sorry for not clarifying this.

Would this suffice?

KG, shredded pine or fir bark fines make up a big chunk of my potting mixes. I shred the nuggets or mulch myself. I've included here a useful link that may help you.

Gary

Here is a link that might be useful: Tapla's container mix formula

There are 7.5 gallons in a cubic foot.