There are, apparently, several varieties of shasta daisy. You might want to contact your professionals and ask what you have. The only other thing we can think of is pH. Sources vary; we’ve seen recommendations from 6.0 to 8.0; another suggests less than 7.0. Could it be that your fertilizer contained too much of the N, the P, or the K? As contrasted with, say, a balanced fertilizer? Does your soil have good drainage? They do not like to stand in water. Those would be our considerations …
There are, apparently, several varieties of shasta daisy. You might want to contact your professionals and ask what you have. The only other thing we can think of is pH. Sources vary; we’ve seen recommendations from 6.0 to 8.0; another suggests less than 7.0. Could it be that your fertilizer contained too much of the N, the P, or the K? As contrasted with, say, a balanced fertilizer? Does your soil have good drainage? They do not like to stand in water. Those would be our considerations …