Hi Brian. You write,
I ... found bark mulch at Home Depot the same size as the
fine grade fir bark... The bag lists bark and forest product
for ingredients

The worry you might have of "forest products" is that it probably contains
much shredded wood as opposed to bark. Whereas bark breaks down to create
nitrogen, wood draws nitrogen from the soil thus depleting the major
nutrient for foliage growth & health.

Best wishes,
Chris... C. Cochrane, , Richmond VA USA

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