(1) are leaves supposed to die off in the fall?
(2) have small blooms(half dollar size) any suggestions?
Note. Have a 5 yr old plant that has never been pruned. is now 3.5 ft high & 6 ft across
Seems you've been ignored.
When you have such questions, you can use your favorite search engine to locate answers.
I went to google.com, then used the search phrase "how to grow montauk daisy" (sans quotes)
Here's just one site I found:
Here is a link that might be useful: growing montauk