My potted Tithonia

I have eight in containers, six are in good shape, if quite fragile in the wind, but two look a little sad in that their leaves are floppy. Why should this be, I wonder.

Thank you.

 

It may have a fungus. This could cause the leaves to brown and die. Or go floppy You can spray the shrub with a fungicide to treat this possibility.

It may also be getting too much water. It is a plant that likes it drier than wetter. If the soil is not drying out enough between watering, this can also cause brown leaves.