I wouldn't say so. They wouldn't bring it back to life, but maybe some blood,fish & bonemeal and a bit of mulch too may help, and a nice drink of water. I'd remove obviously dead parts and then give it time and hope for the best. Good luck.

Wow! It's hard to kill tamarisks. Usually only extreme drought, extreme over fertilization, or bad wind damage would have the symptoms you're describing, Guest. If it's in a container, drought would be my primary suspect. They can use water surprisingly quickly in a container, needing a good soaking up to twice a day. As Mad says, light feeding will help it to recover faster, once you fix the main problem.