Ryan,
Give it a try, but I have always heard bad things happen with Hardwoods in SWC containers. I don't fully understand the "chemistry" but I am told resins and other components in Hardwoods such as Walnut will kill or damage tomato plants.
Microbark is the cheapest component of the 3:2:1 Combo Mix at $2.00 per cubic foot. Look for products which contain small pine bark often called "Clay Soil Conditioner" as an alternative.
Raybo
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