Why Is My Tropical Fern Turning Yellow?
Tropical ferns have survived in the wild since the Mesozoic, but they often yellow and die in the shelter of our homes. Most causes of yellowing ferns are easily addressed, but a few causes are much more problematic. Does this Spark an idea?
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Sunlight
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A simple relocation from a north window to an east window may scorch delicate fronds. Ferns require filtered light. Strong light, even from a reflected source, may cause yellowing leaves. If your fern yellows after you move it, place it back in its original location and monitor the fern closely. Keep in mind that the changing seasons also cause a shift in light.
Moisture
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Waterlogged soil causes yellow fronds and is a major cause of serious fungal diseases. Make sure your fern's soil drains well and check the crown's texture for mushiness, a sign of crown rot. In contrast, low humidity also causes yellow interior fronds. Mist your fern or set them in a water-filled, pebble-lined dish.
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Over-fertilization
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Ferns don't require strong fertilization. In fact, the amount of fertilizer your other potted plants enjoy causes yellowing in ferns. Use fertilizer at half-strength for your ferns, April through September, and don't fertilize during the cool winter months.
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References
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