I have Boston Ferns planted in 10-inch hanging pots on my back porch. They get the morning sun. I have been watering them about every other day or when the container feels light. I usually give each of them about 1 to 2 quarts of water when I water them. I was told to fertilize them with Miracle Grow or another plant food every other week and the weeks I don't fertilize them with Miracle Grow to give them Magnesium Sulfate to help them keep their deep green color. Last week a friend told me she uses Miracid to help keep the ferns a deep green. So I tried it. About three days ago, we had a thunderstorm with high winds. Afterwards, our porch was covered with pieces of the fern leaves. I have also noticed dark brownish black blotches on all the ferns. The ferns have just the stem with no leaves My beautiful full ferns look whimpy and no longer full. Did I over fertilize them? How can I help them regain their fullness and keep them a deep rich green? Thank you for your help.
The following article will help with fertilizing these plants: https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-fertilizer.htm
You can always prune out the unsightly looking fronds and they should regrow just fine. This article will help: https://www.gardeningknowhow.com/houseplants/boston-fern/trimming-boston-ferns.htm