Boston ferns are fabulously popular houseplants. Hardy in USDA zones 9-11, they are kept indoors in pots in most regions. Capable of growing 3 feet (0.9 m) high and 4 feet (1.2 m) wide, Boston ferns can brighten any room with their lush green foliage. That’s why it can be so disheartening to see your vibrant green fern fronds turning black or brown. Keep reading to learn what causes a Boston fern with black fronds, and what to do about it.
There is one case in which a Boston fern with black fronds is perfectly natural, and it’s good to be able to spot it. You may see small black spots on the undersides of your fern’s leaves, lined up in regular rows. These spots are spores, and they’re the fern’s way of reproducing. Eventually, the spores will drop to the soil below and grow into reproductive structures.
If you see these spots, don’t take any action! It’s a sign that your fern is healthy. Your fern will also experience some natural browning as it ages. As new growth emerges, the oldest leaves at the bottom of the fern will wither and turn brown to black to make way for new growth. This is totally normal. Cut away the discolored leaves to keep the plant looking fresh.
Boston fern fronds turning brown or black may also signal trouble, however. If your fern’s leaves are suffering from brown or black spots or strips, there may be nematodes in the soil. Add lots of compost to the soil – this will encourage the growth of beneficial fungi that should destroy the nematodes. If the infestation is bad, remove any infected plants.
Small, but spreading, soft brown to black spots with an unpleasant odor are most likely a sign of bacterial soft rot. Destroy any infected plants.
Leaf tip burn manifests as browning and withering tips on fronds and leaves. Destroy any infected plants.
Rhizoctonia Blight appears as irregular brownish-black spots that start near the crown of the fern but spread very rapidly. Spray with fungicide.
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