Hello everyone,
I am starting to pay more attention to the "quality" of my zinnia plants themselves, in addition to their more obvious blooms. This link is to a page in a book that suggests that zinnia leaves that are long and narrow are desirable. I tend to agree with that goal.
https://books.google.com/books...
Incidentally, you might want to explore the book in that link as much as is convenient for you. That book is one of the more authoritative zinnia references. I have owned that book for several years. It is expensive, but I considered it an investment in my hobby. And it covers the breeding of many different flowers.
I do have a few indoor hybrid of hybrids zinnia plants with those long, slender, sharp "spear point" leaves.
Another example:
And yet another.
Long slender leaves are no longer rare in my breeder zinnias. I hope to eventually get improved plants in all of my zinnias. More later.
ZM