6ft tall sunflower in ceramic pot head has dropped petals withered see single moth on it at night what wrong?

Question

grew normal till last week

Answer 1

It is almost autumn. Flowers need rest even if indoors.

Answer 2

sounds like the normal process for them. Its dying and dropping its head to drop the seeds for reproduction.

Answer 3

sounds like the norm for them..   let  it   stay like a little longer  so you  can get the seeds  

Answer 4

Nothing is wrong.  Your sunflower is going through its natural life cycle. They are annuals and will bloom only once, the flowers then fade and they die.  

Answer 5

Flower's job is to bloom, be pollinated, form seeds, die and disperse seeds.  Nothing is wrong, it did its job.