Q.Chenille Plant
I have just purchased a chenille. It is moist as per instruction, directly above my humidifier, and facing east – the only window in my place. I’ve noticed the flowers have begun to fall off, a few at first but now more rapidly. How can I stop this before all of these beautiful cattails are all gone? The leaves are green and growth does not appear to be stunted. Please help me out.

A Chenille Plant needs a full sun location for best growth.
This plant may be more suited for an indoor location, though it can be wintered over indoors.
Here is a link with care information.
https://www.gardeningknowhow.com/ornamental/flowers/chenille/growing-chenille-plants.htm