Beginner Gardening: Bworn wilted leaves on arrowhead plant, 3 by gshaheen

gshaheen wrote:
Hi,
can someone please help me with my arrowhead plant, first it was having yellow leaves, i thought i may be overwatering, so i now check the soil before i water. Now it is having these brown and wilted leaves , could not find anything suspicious. what can be the reason.

Also for my umbrella plant it has lost almost all leaves except few at top since i have got it from nursery. it has new growth but half of new growth also died for the same reason , leaves turning brown curly and falling. i noticed some whit stuff so sprayed it with rubbing alcohol mixture. no more that white stuff and browning of leaves has slowed down but its not going away and not many leaves r left. what can i do about it. this plant was sitting on the side of a window now i have moved it to front of the window about 6-7 feet away.

thanks
Shaheen