@Carolyn, except for some recently potted Omar's Lebanese Hearts, I don't have any hearts.
A quick googling on blight showed yellowing leaves with brown spots. This does not apply to my problem as the leaves bleach and dry.
Do you know if Silver Fir Tree is resistant to this? It's the only plant that is surviving and even blooming from 10+ varieties! Also, why does the problem dissipate when the plants start spending time outdoors?
I'll take those links if you still believe it's a blight variant
