Answer: Browning foliage can be a normal event (shedding oldest leaves), or it could indicate water stress, damage from late frost, or symptoms of dry air. However, ferns do produce spores on the undersides of the leaves and then the leaf can die so be sure to check the undersides of the leaves. If you find the browning unattractive, you can prune the affected fronds off the plant. New growth should appear from the center of the plant within a few weeks.
Best wishes with your garden!
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