Is bone meal good for day lilies and if so when should I apply it.
I was not able to easily find a fact sheet for you about day lily growing in New York state. I suggest you contact your neighboring county 'Ask an Expert' at the Cornell Extension Service.
Cornell Cooperative Extension of Chautauqua County
3542 Turner Road
Jamestown, New York 14701
(716) 664-9502 (phone)