David, fertilizer may not be the answer. I suggest you check out the info on Mountain Laurels on Yardener.com, Enter problems of mountain laurels. Drought and extended excessive heat may also be issues. That said, Espoma Holly Tone used according to direction on the package would be the one to use. Also, mulching your shrubs with pine bark chips to a depth of 3 to 4 inches will help also. Best And Happy Yardening, Nancy.