In the second picture there are little round objects that look like slow release nitrogen, similar to Osmocote. That would cause some staining. If you didn't put that there, then have the granules analyzed at the extension office. When you fertilize, pull the mulch back and then apply, otherwise alot of the nitrogen evaporates into the air, and is taken up by the mulch biodegrading. Little will make it into the soil. I also agree that pine bark, or needles are a much better mulch than raw wood chips. White Pine is sometimes tricky to transplant. If the root ball becomes broken or loose, they often die.
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