Sphagnum can handle light fertilization without issue. It grows very well locally in typical forest soil alongside small streams containing mine runoff, which is loaded with iron. I also have no problem keeping it as a top dressing for Pogonia and other bog orchids which I fertilize. And while full sun is definitely optimal, the local variety grows very well in deep shade. In shady conditions it's a deep green color, while in full sun it's much lighter in color and takes on a distinct yellow tone in the fall.
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