I do not grow Boston Fern, but I wonder if you can treat it l like the way I treat one of my Hoyas. My Hoya multiflora loves to sit in water. And that is the only way I can make it survive in my indoors. Before it used to just easily throw out the peduncles, struggling to bloom..but I read someone else's experience about it and they mentioned literally sitting it in water. My area is as dry as yours Fiat..maybe it might like it. Sometimes over and underwatering manifest the same on leaves..
