Anyone have any insight into why these leaves are discolored and wilting?
These are two board mounted ferns, and the discoloration happened in a day. One leaf, which you can see in the picture, is already pretty wilted. The issue is only affecting some of the leaves -- last night I thought it was only affecting old leaves, but this morning, it actually seems like newer leaves were hit as well.
These are indoor ferns watered weekly by dunking face-down in the sink. After watering on Sunday, I propped them outside by a NW-facing window to drain and dry.
It was my first time moving them outside to dry this year, as the weather had finally warmed up. Last year through the spring-summer, I routinely hung them outside on watering days to dry, and the plants were fine.
I've never really had a problem with either of these ferns and til now, they seemed to be doing well, with lots of new growth this year. I've been fertilizing with a diluted 10-10-10 monthly.
It was a partially-cloudy day, around 60 degrees, in the northeast United States, so I don't think the sunlight was too harsh.
On the other hand, that was the only new factor I introduced to the watering routine this week, so maybe the leaves really did get scorched?