Update - we just visited Costco and found their Whitney farms garden soil on sale - $2 off - making the additive $7.99@. The package says "add to garden soil".
The ones we chose today WERE warm, not hot, so I'm planning on using 2 and storing 4 in the shed for next year.
We're going to use the WF on top of the soil (and under the mulched leaves) this Spring rather than have it touch the roots since the bags are still warm.
The product is a dark brown and looks like a good additive.
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